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Long-Term Debt and Related Matters - Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt Disclosure [Abstract]
Revolving credit facility	$ 59,149	$ 42,194
Finance leases and financing agreements	535	562
Total	59,684	42,756
Less current maturities	(145)	(153)
Long-term portion	$ 59,539	$ 42,603

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (Parenthetical) - shares	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Stockholders' Equity [Abstract]
Common shares issues net of shares withheld (in shares)	190,837	95,952
Purchase of common shares for treasury (in shares)		168,911

- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	Noncontrolling Interest
Beginning balance at Dec. 31, 2024	$ 179,014	$ 111	$ 43,550	$ 167,579	$ (11,208)	$ (21,716)	$ 698
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(2,117)			(2,110)			(7)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustment	219					103	116
Unrealized derivative gain (loss) on cash flow hedges	(266)					(266)
Purchase of common shares for treasury	(4,277)				(4,277)
Issuance of common shares, net of share withheld for taxes	(1,812)		(2,561)		749
Stock-based compensation	834		834
Ending balance at Mar. 31, 2025	171,595	111	41,823	165,469	(14,736)	(21,879)	807
Beginning balance at Dec. 31, 2025	175,998	111	44,782	175,124	(23,852)	(20,889)	722
Increase (Decrease) in Stockholders' Equity
Net income (loss)	1,492			1,500			(8)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustment	(1,037)					(1,197)	160
Unrealized derivative gain (loss) on cash flow hedges	5					5
Issuance of common shares, net of share withheld for taxes	(3,846)		(7,157)		3,311
Stock-based compensation	1,882		1,882
Ending balance at Mar. 31, 2026	$ 174,494	$ 111	$ 39,507	$ 176,624	$ (20,541)	$ (22,081)	$ 874

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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+ Details

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Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

+ References + Details

- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References + Details

- Definition

Amount of equity (deficit) attributable to parent and noncontrolling interest. Excludes temporary equity.

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Reference 27: http://www.xbrl.org/2003/role/disclosureRef
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Reference 28: http://www.xbrl.org/2003/role/disclosureRef
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Reference 29: http://www.xbrl.org/2003/role/disclosureRef
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Reference 30: http://www.xbrl.org/2003/role/disclosureRef
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Reference 31: http://www.xbrl.org/2003/role/disclosureRef
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Reference 32: http://www.xbrl.org/2003/role/disclosureRef
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Reference 34: http://www.xbrl.org/2003/role/disclosureRef
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Reference 51: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

Long-Term Debt and Related Matters - Narrative (Details)	Jun. 27, 2025 USD ($)	Mar. 31, 2026 USD ($) covenant	Dec. 31, 2025 USD ($)
Line of Credit Facility
Revolving credit facility		$ 59,149,000	$ 42,194,000
Fifth Amended And Restated Credit Agreement \| PNC Bank, N.A., Bank of America, N.A., Citizens Bank, N.A., and Wells Fargo Bank N.A. as Co-Syndication Agents, and Dollar Bank, Federal Savings Bank as a Participant
Line of Credit Facility
Minimum fixed charge coverage ratio	1.1
Fifth Amended And Restated Credit Agreement \| PNC Bank, N.A., Bank of America, N.A., Citizens Bank, N.A., and Wells Fargo Bank N.A. as Co-Syndication Agents, and Dollar Bank, Federal Savings Bank as a Participant \| Debt Instrument, Redemption, Period One
Line of Credit Facility
Number of financial covenants \| covenant		2
Minimum leverage ratio	3.5
Fifth Amended And Restated Credit Agreement \| PNC Bank, N.A., Bank of America, N.A., Citizens Bank, N.A., and Wells Fargo Bank N.A. as Co-Syndication Agents, and Dollar Bank, Federal Savings Bank as a Participant \| Debt Instrument, Redemption, Period Two
Line of Credit Facility
Minimum leverage ratio	4
Fifth Amended And Restated Credit Agreement \| PNC Bank, N.A., Bank of America, N.A., Citizens Bank, N.A., and Wells Fargo Bank N.A. as Co-Syndication Agents, and Dollar Bank, Federal Savings Bank as a Participant \| Overnight Bank Funding Rate
Line of Credit Facility
Debt instrument, basis spread on variable rate	0.50%
Fifth Amended And Restated Credit Agreement \| PNC Bank, N.A., Bank of America, N.A., Citizens Bank, N.A., and Wells Fargo Bank N.A. as Co-Syndication Agents, and Dollar Bank, Federal Savings Bank as a Participant \| Daily Simple SOFR
Line of Credit Facility
Debt instrument, basis spread on variable rate	1.00%
Fifth Amended And Restated Credit Agreement \| PNC Bank, N.A., Bank of America, N.A., Citizens Bank, N.A., and Wells Fargo Bank N.A. as Co-Syndication Agents, and Dollar Bank, Federal Savings Bank as a Participant \| Base Rate \| Minimum
Line of Credit Facility
Debt instrument, basis spread on variable rate	0.25%
Fifth Amended And Restated Credit Agreement \| PNC Bank, N.A., Bank of America, N.A., Citizens Bank, N.A., and Wells Fargo Bank N.A. as Co-Syndication Agents, and Dollar Bank, Federal Savings Bank as a Participant \| Base Rate \| Maximum
Line of Credit Facility
Debt instrument, basis spread on variable rate	1.50%
Fifth Amended And Restated Credit Agreement \| PNC Bank, N.A., Bank of America, N.A., Citizens Bank, N.A., and Wells Fargo Bank N.A. as Co-Syndication Agents, and Dollar Bank, Federal Savings Bank as a Participant \| SOFR \| Minimum
Line of Credit Facility
Debt instrument, basis spread on variable rate	1.25%
Fifth Amended And Restated Credit Agreement \| PNC Bank, N.A., Bank of America, N.A., Citizens Bank, N.A., and Wells Fargo Bank N.A. as Co-Syndication Agents, and Dollar Bank, Federal Savings Bank as a Participant \| SOFR \| Maximum
Line of Credit Facility
Debt instrument, basis spread on variable rate	2.50%
Revolving credit facility \| PNC Bank, N.A., Bank of America, N.A., Citizens Bank, N.A., and Wells Fargo Bank N.A. as Co-Syndication Agents, and Dollar Bank, Federal Savings Bank as a Participant
Line of Credit Facility
Revolving credit facility		$ 832,000
Revolving credit facility \| Fifth Amended And Restated Credit Agreement \| PNC Bank, N.A., Bank of America, N.A., Citizens Bank, N.A., and Wells Fargo Bank N.A. as Co-Syndication Agents, and Dollar Bank, Federal Savings Bank as a Participant
Line of Credit Facility
Debt instrument term	5 years
Line of credit facility, maximum borrowing capacity	$ 150,000,000
Letter of Credit \| Fifth Amended And Restated Credit Agreement \| PNC Bank, N.A., Bank of America, N.A., Citizens Bank, N.A., and Wells Fargo Bank N.A. as Co-Syndication Agents, and Dollar Bank, Federal Savings Bank as a Participant
Line of Credit Facility
Line of credit facility, maximum borrowing capacity	30,000,000
Swing Loan \| Fifth Amended And Restated Credit Agreement \| PNC Bank, N.A., Bank of America, N.A., Citizens Bank, N.A., and Wells Fargo Bank N.A. as Co-Syndication Agents, and Dollar Bank, Federal Savings Bank as a Participant
Line of Credit Facility
Line of credit facility, maximum borrowing capacity	20,000,000
Incremental Loans \| Fifth Amended And Restated Credit Agreement \| PNC Bank, N.A., Bank of America, N.A., Citizens Bank, N.A., and Wells Fargo Bank N.A. as Co-Syndication Agents, and Dollar Bank, Federal Savings Bank as a Participant
Line of Credit Facility
Line of credit facility, maximum borrowing capacity	$ 60,000,000

Accounts Receivable

3 Months Ended

Mar. 31, 2026

Accounts Receivable Additional Disclosures [Abstract]

Accounts Receivable

Changes in reserves for uncollectible accounts are recorded as part of “Selling and administrative expenses” in the Condensed Consolidated Statements of Operations and are recorded net of recoveries of previous write-offs. During the three months ended March 31, 2026 and 2025, the Company recorded a net expense of $300 and $191, respectively. The changes in reserves for uncollectible accounts are net of recoveries of previous write-offs of $522 and $203 for the three months ended March 31, 2026 and 2025, respectively.

The Company established the allowance for credit losses by calculating the amount to reserve based on the age of a given trade receivable and considering historical collection patterns, bad debt expense experience, expected future trends of collections, current and expected market conditions, and any other relevant subjective adjustments as needed. Management maintains high-quality credit review practices and positive customer relationships that mitigate credit risks. The Company’s reserves are regularly reviewed and revised as necessary.

The following table sets forth the Company’s allowance for credit losses:


	Allowance for Credit Losses
Balance as of December 31, 2025	$	1,630
Current period provision	822
Write-off against allowance	(13)

Recoveries of previous write-offs	(522)
Balance as of March 31, 2026	$	1,917

Revenue (Tables)

3 Months Ended

Mar. 31, 2026

Revenue from Contract with Customer [Abstract]

Schedule of Sales by Major Product Line

The following table summarizes the Company’s sales by major product and service line for the periods presented:


	Three Months Ended March 31,
	2026		2025
Rail Products	$	41,279	$	29,319
Global Friction Management	21,707		15,563
Technology Services and Solutions	11,790		9,133
Rail, Technologies, and Services	74,776		54,015
Precast Concrete Products	33,045		28,204
Steel Products	13,323		15,573
Infrastructure Solutions	46,368		43,777
Total net sales	$	121,144	$	97,792

Schedule of Disaggregation of Revenue

Net sales by the timing of the transfer of goods and services were as follows for the periods presented:


	Three Months Ended March 31, 2026
	Rail, Technologies, and Services		Infrastructure Solutions		Total
Point in time	$	63,265	$	31,212	$	94,477
Over time	11,511		15,156		26,667
Total net sales	$	74,776	$	46,368	$	121,144

	Three Months Ended March 31, 2025
	Rail, Technologies, and Services		Infrastructure Solutions		Total
Point in time	$	44,925	$	28,627	$	73,552
Over time	9,090		15,150		24,240
Total net sales	$	54,015	$	43,777	$	97,792

Revenue recognized over time was as follows for the periods presented:


	Three Months Ended March 31,				Percentage of Total Net Sales Three Months Ended March 31,
	2026		2025		2026		2025
Over time input method	$	9,853	$	7,742	8.1	%	7.9	%
Over time output method	16,814		16,498		13.9		16.9
Total over time sales	$	26,667	$	24,240	22.0	%	24.8	%

Schedule of Contract with Customer, Contract Asset, Contract Liability

The following table sets forth the Company’s contract assets:


	Contract Assets
Balance as of December 31, 2025	$	6,395
Revenue recognized but not yet billed	933

Transfers from contract asset balance to accounts receivable	(3,688)
Balance as of March 31, 2026	$	3,640

The following table sets forth the Company’s contract liabilities:


	Contract Liabilities
Balance as of December 31, 2025	$	973
Revenue recognized from contract liabilities	(501)
Increase in billings in excess of cost, excluding revenue recognized	516

Balance as of March 31, 2026	$	988

Earnings Per Common Share (Tables)

3 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

Schedule of Earnings (Loss) Per Share, Basic and Diluted

The following table sets forth the computation of basic and diluted earnings (loss) per common share for the periods indicated:


	Three Months Ended March 31,
	2026		2025
Numerator for basic and diluted earnings (loss) per common share:
Net income (loss) attributable to L.B. Foster Company	$	1,500	$	(2,110)


Denominator:
Weighted average shares outstanding	10,197		10,540
Denominator for basic earnings (loss) per common share	10,197		10,540
Effect of dilutive securities:
Stock compensation plans	387		—
Dilutive potential common shares	387		—
Denominator for diluted earnings (loss) per common share - adjusted weighted average shares outstanding	10,584		10,540


Basic earnings (loss) per common share	$	0.15	$	(0.20)


Diluted earnings (loss) per common share	$	0.14	$	(0.20)

Goodwill and Other Intangible Assets - Schedule of Intangible Asset (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Finite-Lived Intangible Assets
Gross Carrying Value	$ 70,032	$ 70,296
Accumulated Amortization	(59,131)	(58,770)
Net Carrying Amount	10,901	11,526
Patents
Finite-Lived Intangible Assets
Gross Carrying Value	319	324
Accumulated Amortization	(207)	(211)
Net Carrying Amount	112	113
Customer relationships
Finite-Lived Intangible Assets
Gross Carrying Value	28,592	28,771
Accumulated Amortization	(22,481)	(22,331)
Net Carrying Amount	6,111	6,440
Trademarks and trade names
Finite-Lived Intangible Assets
Gross Carrying Value	8,024	8,055
Accumulated Amortization	(5,931)	(5,818)
Net Carrying Amount	2,093	2,237
Technology
Finite-Lived Intangible Assets
Gross Carrying Value	32,770	32,819
Accumulated Amortization	(30,312)	(30,224)
Net Carrying Amount	2,458	2,595
Favorable lease
Finite-Lived Intangible Assets
Gross Carrying Value	327	327
Accumulated Amortization	(200)	(186)
Net Carrying Amount	$ 127	$ 141
Weighted Average Amortization Period In Years \| Patents
Finite-Lived Intangible Assets
Weighted Average Amortization Period In Years	10 years	10 years
Weighted Average Amortization Period In Years \| Customer relationships
Finite-Lived Intangible Assets
Weighted Average Amortization Period In Years	12 years	12 years
Weighted Average Amortization Period In Years \| Trademarks and trade names
Finite-Lived Intangible Assets
Weighted Average Amortization Period In Years	13 years	13 years
Weighted Average Amortization Period In Years \| Technology
Finite-Lived Intangible Assets
Weighted Average Amortization Period In Years	7 years	7 years
Weighted Average Amortization Period In Years \| Favorable lease
Finite-Lived Intangible Assets
Weighted Average Amortization Period In Years	6 years	6 years

Business Segments - Schedule of Asset Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Segment Reporting Information
Depreciation/Amortization	$ 2,895	$ 3,427
Expenditures for Long-Lived Assets	2,960	2,575
Assets	333,783		$ 330,372
Operating Segments
Segment Reporting Information
Depreciation/Amortization	2,372	2,932
Expenditures for Long-Lived Assets	2,233	2,465
Assets	284,648		284,041
Corporate
Segment Reporting Information
Depreciation/Amortization	523	495
Expenditures for Long-Lived Assets	727	110
Assets	49,135		46,331
Rail, Technologies, and Services \| Operating Segments
Segment Reporting Information
Depreciation/Amortization	693	1,168
Expenditures for Long-Lived Assets	274	427
Assets	145,709		155,552
Infrastructure Solutions \| Operating Segments
Segment Reporting Information
Depreciation/Amortization	1,679	1,764
Expenditures for Long-Lived Assets	1,959	$ 2,038
Assets	$ 138,939		$ 128,489

- Definition

Amount of asset recognized for present right to economic benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-05(b)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477314/942-235-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References + Details

Revenue - Schedule of Over Time Sales (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue
Over time sales, amount	$ 26,667	$ 24,240
Over time sales, percentage	22.00%	24.80%
Over time input method
Disaggregation of Revenue
Over time sales, amount	$ 9,853	$ 7,742
Over time sales, percentage	8.10%	7.90%
Over time output method
Disaggregation of Revenue
Over time sales, amount	$ 16,814	$ 16,498
Over time sales, percentage	13.90%	16.90%

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Revenue - Schedule of Sales by Major Product Line (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue
Total net sales	$ 121,144	$ 97,792
Rail, Technologies, and Services
Disaggregation of Revenue
Total net sales	74,776	54,015
Precast Concrete Products
Disaggregation of Revenue
Total net sales	33,045	28,204
Steel Products
Disaggregation of Revenue
Total net sales	13,323	15,573
Infrastructure Solutions
Disaggregation of Revenue
Total net sales	46,368	43,777
Rail Products \| Rail, Technologies, and Services
Disaggregation of Revenue
Total net sales	41,279	29,319
Global Friction Management \| Rail, Technologies, and Services
Disaggregation of Revenue
Total net sales	21,707	15,563
Technology Services and Solutions \| Rail, Technologies, and Services
Disaggregation of Revenue
Total net sales	$ 11,790	$ 9,133

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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+ Details

Business Segments - Schedule of Reconciliation of the Restructuring Liability (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($)
Restructuring Liability
Balance as of December 31, 2025	$ 846
Cash paid	(270)
Balance as of March 31, 2026	$ 576

Basis of Presentation	3 Months Ended
Basis of Presentation	Mar. 31, 2026
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 8 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. The year-end consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by GAAP. In the opinion of management, all estimates and adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three months ended March 31, 2026 are not necessarily indicative of the results that may be expected for the year ending December 31, 2026. This Quarterly Report on Form 10-Q should be read in conjunction with the consolidated financial statements and footnotes thereto included in L.B. Foster Company’s Annual Report on Form 10-K for the year ended December 31, 2025. In this Quarterly Report on Form 10-Q, references to “we,” “us,” “our,” and the “Company” refer collectively to L.B. Foster Company and its consolidated subsidiaries. Recently Issued Accounting Standards In December 2025, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update 2025-12, Codification Improvements (“ASU 2025-12”), to clarify guidance, correct technical errors, remove outdated language and improve consistency across various topics in the Accounting Standards Codification. The amendments in this ASU are effective for annual reporting periods beginning after December 15, 2026, including interim reporting periods within those annual periods. Early adoption is permitted. The Company is currently evaluating the impact of adopting this guidance on the consolidated financial statements. In December 2025, the FASB issued Accounting Standards Update 2025-11, Interim Reporting (Topic 270): Narrow-Scope Improvements (“ASU 2025-11”), to clarify the guidance in Topic 270 to improve consistency of interim financial reporting. ASU 2025-11 provides a list of required interim disclosures and established a disclosure principle requiring entities to disclose events since the end of the last annual report period that have a material impact on the entity. The amendments in ASU 2025-11 are effective for fiscal years beginning after December 15, 2027, including interim reporting periods within those fiscal years, with early adoption permitted. The Company is currently evaluating the impact of adopting this guidance on the consolidated financial statements. In November 2024, the FASB issued Accounting Standards Update 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40) (“ASU 2024-03”), which requires entities to provide more detailed disaggregation of expenses in the income statement, focusing on the nature of the expenses rather than their function. The new disclosures will require public business entities to disclose in the notes to the financial statements, at each interim and annual reporting period, specific information about certain costs and expenses, including purchases of inventory, employee compensation, depreciation, and intangible asset amortization included in each expense caption presented on the face of the income statement, and the total amount of an entity's selling expenses. The amendments are effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027, and may be applied either prospectively or retrospectively. Early adoption is permitted. The Company is currently evaluating the impact of adopting this guidance on the consolidated financial statements.

Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2026

Retirement Benefits [Abstract]

Schedule of Costs of Retirement Plans

The following table summarizes the expense associated with the contributions made to these plans for the periods presented:


	Three Months Ended March 31,
	2026		2025
United States	$	746	$	713
Canada	57		70
United Kingdom	274		271
	$	1,077	$	1,054

Revenue - Schedule of Contract with Customer, Contract Asset, Contract Liability (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($)
Contract Assets
Balance as of December 31, 2025	$ 6,395
Revenue recognized but not yet billed	933
Transfers from contract asset balance to accounts receivable	(3,688)
Balance as of March 31, 2026	3,640
Contract Liabilities
Balance as of December 31, 2025	973
Revenue recognized from contract liabilities	(501)
Increase in billings in excess of cost, excluding revenue recognized	516
Balance as of March 31, 2026	$ 988

Inventory (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Inventory Disclosure [Abstract]
Finished goods	$ 37,430	$ 29,754
Work-in-process	7,653	4,947
Raw materials	23,396	25,518
Inventories - net	$ 68,479	$ 60,219

Long-Term Debt and Related Matters (Tables)

3 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

Long-term debt consisted of the following:


	March 31, 2026		December 31, 2025
Revolving credit facility	$	59,149	$	42,194

Finance leases and financing agreements	535		562
Total	59,684		42,756
Less current maturities	(145)		(153)
Long-term portion	$	59,539	$	42,603

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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+ Details

Business Segments (Tables)

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

The operating results of the Company’s reportable segments were as follows for the periods presented:


	Three Months Ended March 31,
	2026						2025
	Rail, Technologies, and Services		Infrastructure Solutions		Total		Rail, Technologies, and Services		Infrastructure Solutions		Total
Net sales	$	74,776	$	46,368	$	121,144	$	54,015	$	43,777	$	97,792
Less:
Cost of sales	(58,634)		(36,814)		(95,448)		(41,986)		(35,655)		(77,641)
Selling and administrative employment costs	(7,567)		(5,843)		(13,410)		(7,399)		(5,564)		(12,963)
Purchased services (1)	(1,773)		(1,546)		(3,319)		(1,673)		(1,358)		(3,031)
General administrative costs (2)	(1,645)		(1,355)		(3,000)		(1,993)		(1,342)		(3,335)
Amortization expense	(337)		(281)		(618)		(820)		(302)		(1,122)
Segment operating income (loss)	$	4,820	$	529	$	5,349	$	144	$	(444)	$	(300)

Reconciliation of segment operating income
Total segment operating income (loss)					$	5,349					$	(300)
Interest expense - net					(851)						(1,143)
Other income - net					217						318
Public company costs					(1,105)						(1,125)
Corporate executive management costs					(790)						(220)
Corporate management stock-based compensation					(1,409)						(278)

Income (loss) before income taxes					$	1,411					$	(2,748)

(1) Purchased services costs generally include contractor services, insurance expenditures, rental expense, and legal services.

(2)General administrative costs generally include office supplies, utilities, advertising, bad debt expense, and any restructuring expenditures.

Reconciliations of reportable depreciation and amortization and expenditures for long-lived assets to the Company’s consolidated totals are as follows for the periods presented:


	Three Months Ended March 31,
	2026				2025
	Depreciation/Amortization		Expenditures for Long-Lived Assets		Depreciation/Amortization		Expenditures for Long-Lived Assets
Rail, Technologies, and Services	$	693	$	274	$	1,168	$	427
Infrastructure Solutions	1,679		1,959		1,764		2,038
Reportable segments total	$	2,372	$	2,233	$	2,932	$	2,465
Corporate	523		727		495		110
Total	$	2,895	$	2,960	$	3,427	$	2,575

The following table summarizes the Company's total assets by reportable segment for the following periods:


	March 31, 2026		December 31, 2025
Rail, Technologies, and Services	$	145,709	$	155,552
Infrastructure Solutions	138,939		128,489

Reportable segments total	284,648		284,041
Corporate	49,135		46,331
Total	$	333,783	$	330,372

Schedule of Restructuring Reserve

The following table sets forth a reconciliation of the beginning and ending restructuring liability balance for all programs through March 31, 2026:


	Restructuring Liability
Balance as of December 31, 2025	$	846

Cash paid	(270)

Balance as of March 31, 2026	$	576

Revenue - Narrative (Details) $ in Thousands	Mar. 31, 2026 USD ($)
Disaggregation of Revenue
Revenue remaining performance obligation	$ 209,573
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01
Disaggregation of Revenue
Revenue remaining performance obligation	9.80%
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Earnings Per Common Share - Narrative (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2026 shares
Earnings Per Share [Abstract]
Antidilutive shares (in shares)	53

Earnings Per Common Share

3 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

Earnings Per Common Share

(Share amounts in thousands)

The following table sets forth the computation of basic and diluted earnings (loss) per common share for the periods indicated:


	Three Months Ended March 31,
	2026		2025
Numerator for basic and diluted earnings (loss) per common share:
Net income (loss) attributable to L.B. Foster Company	$	1,500	$	(2,110)


Denominator:
Weighted average shares outstanding	10,197		10,540
Denominator for basic earnings (loss) per common share	10,197		10,540
Effect of dilutive securities:
Stock compensation plans	387		—
Dilutive potential common shares	387		—
Denominator for diluted earnings (loss) per common share - adjusted weighted average shares outstanding	10,584		10,540


Basic earnings (loss) per common share	$	0.15	$	(0.20)


Diluted earnings (loss) per common share	$	0.14	$	(0.20)

Diluted earnings per share for the three months ended March 31, 2026 excluded 53 antidilutive shares.

Accounts Receivable - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Financing Receivable, Allowance for Credit Loss [Line Items]
Net expense	$ 822
Recoveries of previous write-offs	(522)	$ (203)
Selling, General and Administrative Expenses
Financing Receivable, Allowance for Credit Loss [Line Items]
Net expense	$ 300	$ 191

Retirement Plans - Narrative (Details)	3 Months Ended
Retirement Plans - Narrative (Details)	Mar. 31, 2026 plan
Defined Benefit Plan Disclosure
Number of defined contribution plans	5
United States
Defined Benefit Plan Disclosure
Number of defined contribution plans	2
Canada
Defined Benefit Plan Disclosure
Number of defined contribution plans	1
United Kingdom
Defined Benefit Plan Disclosure
Number of defined contribution plans	2

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Section 50
-Paragraph 5
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Stock-Based Compensation - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($) board_member shares	Mar. 31, 2025 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation	$ 1,882	$ 834
Expected cost on shares expected to vest	$ 7,140
Recognition period for compensation expense not yet recognized	2 years 2 months 12 days
Number of board members \| board_member	1
Omnibus Plan and Equity and Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation	$ 0	$ 0
Number of stock options outstanding (in shares) \| shares	0	0
Director
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period	1 year
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period	3 years
Performance-Based Stock and Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period	3 years
Restricted Stock and Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation	$ 675

Long-Term Debt and Related Matters

3 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

Long-Term Debt and Related Matters

Long-term debt consisted of the following:


	March 31, 2026		December 31, 2025
Revolving credit facility	$	59,149	$	42,194

Finance leases and financing agreements	535		562
Total	59,684		42,756
Less current maturities	(145)		(153)
Long-term portion	$	59,539	$	42,603

On June 27, 2025, the Company, its domestic subsidiaries, and certain of its Canadian and United Kingdom subsidiaries (collectively, the “Borrowers”), entered into the Fifth Amended and Restated Credit Agreement (the “Credit Agreement”) with PNC Bank, N.A., Bank of America, N.A., Citizens Bank, N.A., and Wells Fargo Bank N.A. as Co-Syndication Agents, and Dollar Bank, Federal Savings Bank as a participant. The Credit Agreement, which expires on June 27, 2030, provides for a five-year, revolving credit facility that permits aggregate borrowings of the Borrowers up to $150,000 with sublimits for (a) the issuance of letters of credit in dollars and in alternative currencies in an amount not to exceed the dollar equivalent of $30,000, and (b) borrowings of swing loans in dollars in an amount not to exceed $20,000; and with an incremental loan feature not to exceed $60,000.

The Company’s obligations under the Credit Agreement are secured by the grant of a security interest by the Borrowers in substantially all of the assets owned by such entities. Additionally, the equity interests in each of the loan parties, other than the Company, and the equity interests held by each loan party in their subsidiaries, have been pledged to the lenders as collateral for the lending obligations.

Borrowings under the Credit Agreement will bear interest at rates based upon either the base rate or Term SOFR rate plus applicable margins. Applicable margins are dictated by the ratio of the Company’s total net indebtedness to the Company’s consolidated EBITDA for four trailing quarters, as defined in the Credit Agreement. The base rate is the highest of (a) the Overnight Bank Funding Rate plus 0.50%, (b) the Prime Rate, or (c) the Daily Simple SOFR rate plus 1.00% so long as the Daily Simple SOFR rate is offered, ascertainable and not unlawful (each as defined in the Credit Agreement). The base rate and Term SOFR rate spreads range from 0.25% to 1.50% and 1.25% to 2.50%, respectively.

The Credit Agreement includes two financial covenants: (a) Maximum Gross Leverage Ratio, defined as the Company’s Consolidated Indebtedness divided by the Company’s Consolidated EBITDA, which must not exceed (i) 3.50 to 1.00 for all testing periods other than during an Acquisition Period, and (ii) 4.00 to 1.00 for all testing periods occurring during an Acquisition Period, and (b) Minimum Consolidated Fixed Charge Coverage Ratio, defined as the Company’s Consolidated EBITDA divided by the Company’s Fixed Charges, which must be more than 1.10 to 1.00.

As of March 31, 2026, the Company was in compliance with the covenants in the Credit Agreement, as amended, and had outstanding letters of credit of approximately $832.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8A
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Cover - shares	3 Months Ended
Cover - shares	Mar. 31, 2026	Apr. 30, 2026
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2026
Document Transition Report	false
Commission File Number	000-10436
Entity Registrant Name	L.B. Foster Company
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	25-1324733
Entity Address, Street Name	415 Holiday Drive
Entity Address, Suite	Suite 100
Entity Address, City	Pittsburgh
Entity Address, State	PA
Entity Address, Postal Zip Code	15220
City Area Code	412
Local Phone Number	928-3400
Title of 12(b) Security	Common Stock, par value $0.01
Trading Symbol	FSTR
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		10,458,680
Amendment Flag	false
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q1
Entity Central Index Key	0000352825
Current Fiscal Year End Date	--12-31

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Numerator for basic and diluted earnings (loss) per common share:
Net income (loss) attributable to L.B. Foster Company	$ 1,500	$ (2,110)
Denominator:
Weighted average shares outstanding (in shares)	10,197	10,540
Denominator for basic earnings (loss) per common share (in shares)	10,197	10,540
Effect of dilutive securities:
Stock compensation plans (in shares)	387	0
Dilutive potential common shares (in shares)	387	0
Denominator for diluted earnings (loss) per common share - adjusted weighted average shares outstanding (in shares)	10,584	10,540
Basic earnings (loss) per common share (in USD per share)	$ 0.15	$ (0.20)
Diluted earnings (loss) per common share (in USD per share)	$ 0.14	$ (0.20)

Stock-Based Compensation

3 Months Ended

Mar. 31, 2026

Share-Based Payment Arrangement, Noncash Expense [Abstract]

Stock-Based Compensation

The Company recorded stock-based compensation expense of $1,882 and $834 for the three months ended March 31, 2026 and 2025, respectively, related to restricted stock awards, restricted stock units, and performance-based stock and stock unit awards. As of March 31, 2026, unrecognized compensation expense for awards that the Company expects to vest approximated $7,140. The Company will recognize this unrecognized compensation expense over a weighted average 2.2 years through May 22, 2028.

On May 22, 2025, the shareholders approved the new 2025 Equity and Incentive Compensation Plan (the “Equity and Incentive Compensation Plan”). As of March 31, 2026, the Company had stock awards issued pursuant to the Equity and Incentive Compensation Plan and its predecessor, the 2006 Omnibus Incentive Compensation Plan (the “Omnibus Plan”). No stock options are outstanding under the Omnibus Plan or the Equity and Incentive Compensation Plan and, as such, there was no stock-based compensation expense related to stock options recorded for the three months ended March 31, 2026 and 2025.

Non-Employee Director Restricted Stock Awards and Fully-Vested Stock

Since May 2018, non-employee directors have been awarded shares of the Company’s common stock on each date the non-employee directors were elected at the annual shareholders’ meeting to serve as directors, subject to a one-year vesting requirement. The Deferred Compensation Plan for Non-Employee Directors under the Omnibus Plan and, by amendment, under the Equity and Incentive Compensation Plan, permits non-employee directors of the Company to defer receipt of earned cash and/or stock compensation for service on the Board into deferred stock units. Non-Employee directors may also elect to receive quarterly cash compensation in the form of fully-vested stock. During 2026, one Board member has elected to receive fully-vested stock in lieu of cash compensation.

Restricted Stock, Restricted Stock Units, and Performance-Based Stock and Stock Units

Under the Equity and Incentive Compensation Plan and Omnibus Plan, the Company grants certain employees restricted stock, restricted stock units, and performance-based stock and stock units. The forfeitable restricted stock awards granted generally time-vest ratably over a three-year period, unless indicated otherwise by the underlying restricted stock award agreement. Performance stock unit awards are offered annually under separate three-year long-term incentive programs, unless indicated otherwise by the underlying performance unit award agreement. Performance stock units are subject to forfeiture and will be converted into common stock based upon the Company’s performance relative to performance measures and conversion multiples as defined in the underlying program. For restricted stock units granted in 2026, participants who meet the definition of normal retirement, as defined in the 2026 Restricted Stock Unit Agreement filed as Exhibit 10.1 to this Quarterly Report on Form 10-Q, the awards continue to vest without the requirement of future service; for these awards, the Company recognizes compensation expense over the period from grant date through the date the employee becomes retirement eligible. During the three months ended March 31, 2026, the Company recognized $675 of stock-based compensation expense associated with the accelerated expense recognition for retirement-eligible employees.

The following table summarizes the restricted stock, restricted stock units, and performance-based stock and stock unit activity for the periods presented:


	Restricted Stock	Restricted Stock Units	Performance-Based Stock and Stock Units*	Weighted Average Grant Date Fair Value
Outstanding as of December 31, 2025	191,032	—	523,934	$	16.56
Granted	—	56,127	78,245	31.13
Vested	(59,111)	—	(239,786)	12.76

Cancelled and forfeited	—	—	(86,833)	10.06
Outstanding as of March 31, 2026	131,921	56,127	275,560	$	24.63

*Includes stock units for which the performance obligation has been met and are only subject to time vesting requirements prior to distribution.

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ (81)	$ (631)
Income (loss) before income taxes	$ 1,411	$ (2,748)
Effective income tax rate	(5.70%)	23.00%

- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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+ Details

Basis of Presentation (Policies)	3 Months Ended
Basis of Presentation (Policies)	Mar. 31, 2026
Accounting Policies [Abstract]
Basis of Presentation	The accompanying unaudited Condensed Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 8 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. The year-end consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by GAAP. In the opinion of management, all estimates and adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three months ended March 31, 2026 are not necessarily indicative of the results that may be expected for the year ending December 31, 2026. This Quarterly Report on Form 10-Q should be read in conjunction with the consolidated financial statements and footnotes thereto included in L.B. Foster Company’s Annual Report on Form 10-K for the year ended December 31, 2025. In this Quarterly Report on Form 10-Q, references to “we,” “us,” “our,” and the “Company” refer collectively to L.B. Foster Company and its consolidated subsidiaries.
Recently Issued Accounting Standards	Recently Issued Accounting Standards In December 2025, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update 2025-12, Codification Improvements (“ASU 2025-12”), to clarify guidance, correct technical errors, remove outdated language and improve consistency across various topics in the Accounting Standards Codification. The amendments in this ASU are effective for annual reporting periods beginning after December 15, 2026, including interim reporting periods within those annual periods. Early adoption is permitted. The Company is currently evaluating the impact of adopting this guidance on the consolidated financial statements. In December 2025, the FASB issued Accounting Standards Update 2025-11, Interim Reporting (Topic 270): Narrow-Scope Improvements (“ASU 2025-11”), to clarify the guidance in Topic 270 to improve consistency of interim financial reporting. ASU 2025-11 provides a list of required interim disclosures and established a disclosure principle requiring entities to disclose events since the end of the last annual report period that have a material impact on the entity. The amendments in ASU 2025-11 are effective for fiscal years beginning after December 15, 2027, including interim reporting periods within those fiscal years, with early adoption permitted. The Company is currently evaluating the impact of adopting this guidance on the consolidated financial statements. In November 2024, the FASB issued Accounting Standards Update 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40) (“ASU 2024-03”), which requires entities to provide more detailed disaggregation of expenses in the income statement, focusing on the nature of the expenses rather than their function. The new disclosures will require public business entities to disclose in the notes to the financial statements, at each interim and annual reporting period, specific information about certain costs and expenses, including purchases of inventory, employee compensation, depreciation, and intangible asset amortization included in each expense caption presented on the face of the income statement, and the total amount of an entity's selling expenses. The amendments are effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027, and may be applied either prospectively or retrospectively. Early adoption is permitted. The Company is currently evaluating the impact of adopting this guidance on the consolidated financial statements.

Goodwill and Other Intangible Assets - Schedule of Goodwill (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($)
Goodwill
Balance as of December 31, 2025	$ 33,062
Foreign currency translation impact	(329)
Balance as of March 31, 2026	32,733
Rail, Technologies, and Services
Goodwill
Balance as of December 31, 2025	21,386
Foreign currency translation impact	(329)
Balance as of March 31, 2026	21,057
Infrastructure Solutions
Goodwill
Balance as of December 31, 2025	11,676
Foreign currency translation impact	0
Balance as of March 31, 2026	$ 11,676

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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+ Details

Accounts Receivable - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Allowance for Credit Losses
Allowance for doubtful accounts, beginning balance	$ 1,630
Current period provision	822
Write-off against allowance	(13)
Recoveries of previous write-offs	(522)	$ (203)
Allowance for doubtful accounts, ending balance	$ 1,917

Retirement Plans

3 Months Ended

Mar. 31, 2026

Retirement Benefits [Abstract]

Retirement Plans

The Company has two defined contribution retirement plans that cover its hourly and salaried employees in the United States. Employees are eligible to participate in the appropriate plan based on employment classification. The Company’s contributions to the defined contribution plans are governed by the Employee Retirement Income Security Act of 1974, as amended (“ERISA”) and the Company’s policy and investment guidelines applicable to each respective plan. The Company’s policy is to contribute at least the minimum in accordance with the funding standards of ERISA. The Company maintains one defined contribution plan for its employees in Canada. In the United Kingdom, the Company maintains two defined contribution plans and a defined benefit plan, which is frozen.

On May 23, 2024, the Company's Board of Directors approved the termination of the frozen Portec Rail Products (UK) Limited Pension Scheme (the “UK DB Plan”). At such time, the Company notified all plan participants of the Company's intentions to terminate and fully settle the obligations. In January 2025, the Company entered into an insurance buy-in contract with a third party insurer which resulted in an exchange of plan assets of the UK DB Plan for an annuity that covers our future projected benefit obligations. The Company expects the buy out of the plan and transfer of future benefit obligations of plan participants to be completed in 2026. The Company does not expect to make any further contributions to the UK DB Plan.

Defined Contribution Plans

The Company sponsors five defined contribution plans for hourly and salaried employees across its domestic and international facilities. The following table summarizes the expense associated with the contributions made to these plans for the periods presented:


	Three Months Ended March 31,
	2026		2025
United States	$	746	$	713
Canada	57		70
United Kingdom	274		271
	$	1,077	$	1,054

- Definition

The entire disclosure for retirement benefits.

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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/715/tableOfContent

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
-Paragraph 1
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (r)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2026

Share-Based Payment Arrangement, Noncash Expense [Abstract]

Schedule of Nonvested Share Activity

The following table summarizes the restricted stock, restricted stock units, and performance-based stock and stock unit activity for the periods presented:


	Restricted Stock	Restricted Stock Units	Performance-Based Stock and Stock Units*	Weighted Average Grant Date Fair Value
Outstanding as of December 31, 2025	191,032	—	523,934	$	16.56
Granted	—	56,127	78,245	31.13
Vested	(59,111)	—	(239,786)	12.76

Cancelled and forfeited	—	—	(86,833)	10.06
Outstanding as of March 31, 2026	131,921	56,127	275,560	$	24.63

*Includes stock units for which the performance obligation has been met and are only subject to time vesting requirements prior to distribution.

Revenue

3 Months Ended

Mar. 31, 2026

Revenue from Contract with Customer [Abstract]

Revenue

The following table summarizes the Company’s sales by major product and service line for the periods presented:


	Three Months Ended March 31,
	2026		2025
Rail Products	$	41,279	$	29,319
Global Friction Management	21,707		15,563
Technology Services and Solutions	11,790		9,133
Rail, Technologies, and Services	74,776		54,015
Precast Concrete Products	33,045		28,204
Steel Products	13,323		15,573
Infrastructure Solutions	46,368		43,777
Total net sales	$	121,144	$	97,792

The majority of the Company’s revenue is from products transferred and services rendered to customers at a point in time. The Company recognizes revenue at the point in time at which the customer obtains control of the product or service, which is generally when the product title passes to the customer upon shipment or the service has been rendered to the customer. In limited cases, title does not transfer and revenue is not recognized until the customer has received the products at a designated physical location.

Net sales by the timing of the transfer of goods and services were as follows for the periods presented:


	Three Months Ended March 31, 2026
	Rail, Technologies, and Services		Infrastructure Solutions		Total
Point in time	$	63,265	$	31,212	$	94,477
Over time	11,511		15,156		26,667
Total net sales	$	74,776	$	46,368	$	121,144

	Three Months Ended March 31, 2025
	Rail, Technologies, and Services		Infrastructure Solutions		Total
Point in time	$	44,925	$	28,627	$	73,552
Over time	9,090		15,150		24,240
Total net sales	$	54,015	$	43,777	$	97,792

The Company’s performance obligations under long-term agreements with its customers are generally satisfied over time. Over time revenue is primarily comprised of transit infrastructure and technology services and solutions projects within the Rail segment, precast concrete buildings within the Precast Concrete Products division in the Infrastructure segment, and long-term bridge projects within the Steel Products division in the Infrastructure segment. Revenue under these long-term agreements is generally recognized over time using an input measure based upon the proportion of actual costs incurred to estimated total project costs or an output method, specifically units delivered, based upon certain customer acceptance and delivery requirements.

Accounting for these long-term agreements involves the use of various techniques to estimate total revenues and costs. The Company estimates profit on these long-term agreements as the difference between total estimated revenues and expected costs to complete a contract and recognizes that profit over the life of the contract. Contract estimates are based on various assumptions to project the outcome of future events that may span several years. These assumptions include, among other things, labor productivity, cost and availability of materials, and timing of funding by customers. The nature of these long-term agreements may give rise to several types of variable consideration, such as claims and awards. Contract estimates may include additional revenue for submitted contract modifications, including at times unapproved change orders, if there exists an enforceable right to the modification, the amount can be reasonably estimated, and its realization is probable. These estimates are based on historical collection experience, anticipated performance, and the Company’s best judgment at that time. These amounts are generally included in the contract’s transaction price and are allocated over the remaining performance obligations. As a result of management's reviews of contract-related estimates, the Company makes adjustments to contract estimates that impact our revenue and profit totals. Changes in estimates are primarily attributed to updated considerations, including economic conditions and historic contract patterns, resulting in changes to anticipated revenue from existing contracts. The Company’s estimates related to these long-term agreements are further described in “Note 3.

Revenue” of the Notes to the Company’s Consolidated Financial Statements contained in its Annual Report on Form 10-K for the year ended December 31, 2025.

Revenue recognized over time was as follows for the periods presented:


	Three Months Ended March 31,				Percentage of Total Net Sales Three Months Ended March 31,
	2026		2025		2026		2025
Over time input method	$	9,853	$	7,742	8.1	%	7.9	%
Over time output method	16,814		16,498		13.9		16.9
Total over time sales	$	26,667	$	24,240	22.0	%	24.8	%

The timing of revenue recognition, billings, and cash collections results in billed receivables, costs in excess of billings (included in “Contract assets - net”), and billings in excess of costs (contract liabilities), included in “Deferred revenue” within the Condensed Consolidated Balance Sheets.

The following table sets forth the Company’s contract assets:


	Contract Assets
Balance as of December 31, 2025	$	6,395
Revenue recognized but not yet billed	933

Transfers from contract asset balance to accounts receivable	(3,688)
Balance as of March 31, 2026	$	3,640

The following table sets forth the Company’s contract liabilities:


	Contract Liabilities
Balance as of December 31, 2025	$	973
Revenue recognized from contract liabilities	(501)
Increase in billings in excess of cost, excluding revenue recognized	516

Balance as of March 31, 2026	$	988

The Company has established policies regarding allowance for credit losses associated with contract assets, which includes standalone reserve assessments for its long term, complex contracts as needed as well as detailed regular review and updates to contract margins, progress, and value. A standard reserve threshold is applied to contract assets related to short term, less complex contracts. Management also regularly reviews collection patterns and future expected collections and makes necessary revisions to allowance for credit losses related to contract assets.

As of March 31, 2026, the Company had approximately $209,573 of remaining performance obligations, which is also referred to as backlog. Approximately 9.8% of the March 31, 2026 backlog was related to projects that are anticipated to extend beyond March 31, 2027.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-9

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-10

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-15

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-13

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org/606/tableOfContent

+ Details

Stock-Based Compensation - Restricted Stock and Performance Share Units (Details)	3 Months Ended
	Mar. 31, 2026 $ / shares shares
Weighted Average Grant Date Fair Value
Weighted average share price, beginning balance (in USD per share) \| $ / shares	$ 16.56
Weighted average shares granted (in USD per share) \| $ / shares	31.13
Weighted average shares vested (in USD per share) \| $ / shares	12.76
Weighted average grant date fair value, cancelled and forfeited (in USD per share) \| $ / shares	10.06
Weighted average share price, ending balance (in USD per share) \| $ / shares	$ 24.63
Restricted Stock
Restricted Stock and Performance Share Units
Outstanding, beginning balance (in shares)	191,032
Granted (in shares)	0
Vested (in shares)	(59,111)
Cancelled and forfeited (in shares)	0
Outstanding, ending balance (in shares)	131,921
Restricted Stock Units
Restricted Stock and Performance Share Units
Outstanding, beginning balance (in shares)	0
Granted (in shares)	56,127
Vested (in shares)	0
Cancelled and forfeited (in shares)	0
Outstanding, ending balance (in shares)	56,127
Performance-Based Stock and Stock Units
Restricted Stock and Performance Share Units
Outstanding, beginning balance (in shares)	523,934
Granted (in shares)	78,245
Vested (in shares)	(239,786)
Cancelled and forfeited (in shares)	(86,833)
Outstanding, ending balance (in shares)	275,560

Retirement Plans - Schedule of Costs of Retirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Defined Contribution Plan Disclosure
Expenses associated with contributions made	$ 1,077	$ 1,054
United States
Defined Contribution Plan Disclosure
Expenses associated with contributions made	746	713
Canada
Defined Contribution Plan Disclosure
Expenses associated with contributions made	57	70
United Kingdom
Defined Contribution Plan Disclosure
Expenses associated with contributions made	$ 274	$ 271

Commitments and Contingent Liabilities (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($) party	Dec. 31, 2025 USD ($)	Mar. 26, 2020 party	Jun. 05, 2017 company
Commitments and Contingencies Disclosure [Abstract]
Number of companies that received a general notice letter (company) \| company				140
Present value of remedial work	$ 1,100,000
Undiscovered remedial work	$ 1,700,000
Anticipated clean period	13 years
Number of potentially responsible parties included in agreement \| party	100
Number of parties required to perform remedial design work \| party			2
Accrual for environmental loss	$ 1,495	$ 1,495

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Current assets:
Cash and cash equivalents	$ 3,991	$ 4,348
Accounts receivable - net (Note 5)	77,907	80,551
Contract assets - net (Note 3)	3,640	6,395
Inventories - net (Note 6)	68,479	60,219
Other current assets	8,192	5,358
Total current assets	162,209	156,871
Property, plant, and equipment - net	77,347	77,183
Operating lease right-of-use assets - net	27,181	28,309
Other assets:
Goodwill (Note 4)	32,733	33,062
Other intangibles - net (Note 4)	10,901	11,526
Deferred tax assets (Note 9)	20,497	20,355
Other assets	2,915	3,066
TOTAL ASSETS	333,783	330,372
Current liabilities:
Accounts payable	44,092	52,519
Deferred revenue (Note 3)	8,670	5,900
Accrued payroll and employee benefits	6,579	11,346
Current maturities of long-term debt (Note 7)	145	153
Other accrued liabilities	13,466	14,003
Total current liabilities	72,952	83,921
Long-term debt (Note 7)	59,539	42,603
Deferred tax liabilities (Note 9)	871	903
Long-term operating lease liabilities	23,258	24,266
Other long-term liabilities	2,669	2,681
Stockholders’ equity:
Common stock, par value $0.01, authorized 20,000,000 shares; shares issued at March 31, 2026 and December 31, 2025, 11,115,779; shares outstanding at March 31, 2026 and December 31, 2025, 10,326,247 and 10,135,410, respectively	111	111
Paid-in capital	39,507	44,782
Retained earnings	176,624	175,124
Treasury stock - at cost, 789,532 and 980,369 common stock shares at March 31, 2026 and December 31, 2025, respectively	(20,541)	(23,852)
Accumulated other comprehensive loss	(22,081)	(20,889)
Total L.B. Foster Company stockholders’ equity	173,620	175,276
Noncontrolling interest	874	722
Total stockholders’ equity	174,494	175,998
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 333,783	$ 330,372

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Total net sales	$ 121,144	$ 97,792
Total cost of sales	95,448	77,641
Gross profit	25,696	20,151
Selling and administrative expenses	23,033	20,952
Amortization expense	618	1,122
Operating income (loss)	2,045	(1,923)
Interest expense - net	851	1,143
Other income - net	(217)	(318)
Income (loss) before income taxes	1,411	(2,748)
Income tax benefit	(81)	(631)
Net income (loss)	1,492	(2,117)
Net loss attributable to noncontrolling interest	(8)	(7)
Net income (loss) attributable to L.B. Foster Company	$ 1,500	$ (2,110)
Per share data attributable to L.B. Foster shareholders:
Basic earnings (loss) per common share (in USD per share)	$ 0.15	$ (0.20)
Diluted earnings (loss) per common share (in USD per share)	$ 0.14	$ (0.20)
Basic weighted average shares outstanding (in shares)	10,197	10,540
Diluted weighted average shares outstanding (in shares)	10,584	10,540
Sales of goods
Total net sales	$ 105,188	$ 86,548
Total cost of sales	80,933	66,938
Sales of services
Total net sales	15,956	11,244
Total cost of sales	$ 14,515	$ 10,703

Inventory

3 Months Ended

Mar. 31, 2026

Inventory Disclosure [Abstract]

Inventory

Inventory is valued at average cost or net realizable value, whichever is lower. The Company’s components of inventory are summarized in the following table for the periods presented:


	March 31, 2026		December 31, 2025
Finished goods	$	37,430	$	29,754
Work-in-process	7,653		4,947
Raw materials	23,396		25,518
Inventories - net	$	68,479	$	60,219

Goodwill and Other Intangible Assets

3 Months Ended

Mar. 31, 2026

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

The following table presents the changes in goodwill balance by reportable segment for the period presented:


	Rail, Technologies, and Services		Infrastructure Solutions		Total
Balance as of December 31, 2025	$	21,386	$	11,676	$	33,062


Foreign currency translation impact	(329)		—		(329)


Balance as of March 31, 2026	$	21,057	$	11,676	$	32,733

The Company performs goodwill impairment tests annually during the fourth quarter, and also performs interim goodwill impairment tests if it is determined that it is more likely than not that the fair value of a reporting unit is less than the carrying amount. Qualitative factors are assessed to determine whether it is more likely than not that the fair value of a reporting unit is less than the carrying

amount, which includes the impacts of current economic conditions, including but not limited to concerns related to inflation, tariffs, labor markets, supply chains, and changes in trade policy. However, these factors can be unpredictable and are subject to change. No interim goodwill impairment test was required as a result of the evaluation of qualitative factors as of March 31, 2026. However, future impairment charges could result if future projections diverge unfavorably from current expectations.

The following table sets forth the components of the Company’s intangible assets for the periods presented:


	March 31, 2026
	Weighted Average Amortization Period In Years	Gross Carrying Value		Accumulated Amortization		Net Carrying Amount

Patents	10	$	319	$	(207)	$	112
Customer relationships	12	28,592		(22,481)		6,111
Trademarks and trade names	13	8,024		(5,931)		2,093
Technology	7	32,770		(30,312)		2,458
Favorable lease	6	327		(200)		127
		$	70,032	$	(59,131)	$	10,901


	December 31, 2025
	Weighted Average Amortization Period In Years	Gross Carrying Value		Accumulated Amortization		Net Carrying Amount
Patents	10	$	324	$	(211)	$	113
Customer relationships	12	28,771		(22,331)		6,440
Trademarks and trade names	13	8,055		(5,818)		2,237
Technology	7	32,819		(30,224)		2,595
Favorable lease	6	327		(186)		141
		$	70,296	$	(58,770)	$	11,526

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2026
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Revenue - Schedule of Timing of Transfer (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue
Total net sales	$ 121,144	$ 97,792
Point in time
Disaggregation of Revenue
Total net sales	94,477	73,552
Over time
Disaggregation of Revenue
Total net sales	26,667	24,240
Rail, Technologies, and Services
Disaggregation of Revenue
Total net sales	74,776	54,015
Rail, Technologies, and Services \| Point in time
Disaggregation of Revenue
Total net sales	63,265	44,925
Rail, Technologies, and Services \| Over time
Disaggregation of Revenue
Total net sales	11,511	9,090
Infrastructure Solutions
Disaggregation of Revenue
Total net sales	46,368	43,777
Infrastructure Solutions \| Point in time
Disaggregation of Revenue
Total net sales	31,212	28,627
Infrastructure Solutions \| Over time
Disaggregation of Revenue
Total net sales	$ 15,156	$ 15,150

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Business Segments - Schedule of Reconciliation of Operating Income to Income Before Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information
Net sales	$ 121,144	$ 97,792
Less:
Cost of sales	(95,448)	(77,641)
Amortization expense	(618)	(1,122)
Operating income (loss)	2,045	(1,923)
Interest expense - net	(851)	(1,143)
Other income - net	217	318
Income (loss) before income taxes	1,411	(2,748)
Rail, Technologies, and Services
Segment Reporting Information
Net sales	74,776	54,015
Infrastructure Solutions
Segment Reporting Information
Net sales	46,368	43,777
Operating Segments
Segment Reporting Information
Net sales	121,144	97,792
Less:
Cost of sales	(95,448)	(77,641)
Selling and administrative employment costs	(13,410)	(12,963)
Purchased services	(3,319)	(3,031)
General administrative costs	(3,000)	(3,335)
Amortization expense	(618)	(1,122)
Operating income (loss)	5,349	(300)
Operating Segments \| Rail, Technologies, and Services
Segment Reporting Information
Net sales	74,776	54,015
Less:
Cost of sales	(58,634)	(41,986)
Selling and administrative employment costs	(7,567)	(7,399)
Purchased services	(1,773)	(1,673)
General administrative costs	(1,645)	(1,993)
Amortization expense	(337)	(820)
Operating income (loss)	4,820	144
Operating Segments \| Infrastructure Solutions
Segment Reporting Information
Net sales	46,368	43,777
Less:
Cost of sales	(36,814)	(35,655)
Selling and administrative employment costs	(5,843)	(5,564)
Purchased services	(1,546)	(1,358)
General administrative costs	(1,355)	(1,342)
Amortization expense	(281)	(302)
Operating income (loss)	529	(444)
Corporate And Reconciling Items
Less:
Interest expense - net	(851)	(1,143)
Other income - net	217	318
Public company costs	(1,105)	(1,125)
Corporate executive management costs	(790)	(220)
Corporate management stock-based compensation	$ (1,409)	$ (278)

Business Segments

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

Business Segments

The Company is a global technology solutions provider of engineered, manufactured products and services that builds and supports infrastructure. The Company determines its operating segments based on how the Company's Chief Operating Decision Maker (“CODM”), the Company's President and Chief Executive Officer, manages the businesses, including resource allocation and operating decisions. The Company is organized into two operating segments, which represent the individual businesses that are run separately within this operational structure.

The Company has two reportable segments: Rail, Technologies, and Services (“Rail”), and Infrastructure Solutions (“Infrastructure”). The Company’s segments represent components of the Company (a) that engage in activities from which revenue is generated and expenses are incurred, (b) whose operating results are regularly reviewed by the CODM, who uses such information to make decisions about resources to be allocated to the segments, and (c) for which discrete financial information is available. The CODM uses segment operating income to determine resources to allocate to each segment (including personnel and financial resources) during the annual budgeting process. The CODM evaluates segment performance regularly by comparing the segment operating income to the budgeted measure.

Operating segments are evaluated on their segment operating income contribution to the Company’s consolidated results. The Company considers the aggregation of operating segments into reporting segments based on the nature of offerings, nature of production services, the type or class of customer for products and services, methods used to distribute products and services, and economic and regulatory environment conditions.

Segment operating income includes reportable segment gross profit and direct expenses such as salaries, benefits, restructuring, research and development, professional and purchased services expenditures, amortization expense, bad debt expense, and other segment expenses. Additionally, segment operating income includes allocated corporate operating expenses associated with central services such as quality, logistics, environmental health and safety, information technology, insurance, and human resources. Other corporate functional costs that are associated with the operating segments are also allocated to the segments such as finance, marketing, credit and collections, and treasury functions. Operating expenses related to corporate headquarter functions are allocated to each segment based on segment headcount, revenue contribution, or activity of the business units within the segments, based on the corporate activity type provided to the segment. Management believes the allocation of corporate operating expenses provides an accurate presentation of how the segments utilize corporate support activities. This provides the CODM meaningful segment profitability information to support operating decisions and the allocation of resources.

Certain corporate costs are separately managed on a consolidated basis and are not allocated to the operating segments. These corporate costs include public company costs such as listing fees, audit fees, compliance costs, insurance costs, and Board of Directors fees. Additionally, certain corporate executive management costs, including costs of the corporate executive leadership team, and corporate management stock-based compensation expenses are not allocated to the operating segments. Finally, interest expense, net and certain other items included in “Other income - net”, which are managed on a consolidated basis, are not allocated to the operating segments.

The operating results of the Company’s reportable segments were as follows for the periods presented:


	Three Months Ended March 31,
	2026						2025
	Rail, Technologies, and Services		Infrastructure Solutions		Total		Rail, Technologies, and Services		Infrastructure Solutions		Total
Net sales	$	74,776	$	46,368	$	121,144	$	54,015	$	43,777	$	97,792
Less:
Cost of sales	(58,634)		(36,814)		(95,448)		(41,986)		(35,655)		(77,641)
Selling and administrative employment costs	(7,567)		(5,843)		(13,410)		(7,399)		(5,564)		(12,963)
Purchased services (1)	(1,773)		(1,546)		(3,319)		(1,673)		(1,358)		(3,031)
General administrative costs (2)	(1,645)		(1,355)		(3,000)		(1,993)		(1,342)		(3,335)
Amortization expense	(337)		(281)		(618)		(820)		(302)		(1,122)
Segment operating income (loss)	$	4,820	$	529	$	5,349	$	144	$	(444)	$	(300)

Reconciliation of segment operating income
Total segment operating income (loss)					$	5,349					$	(300)
Interest expense - net					(851)						(1,143)
Other income - net					217						318
Public company costs					(1,105)						(1,125)
Corporate executive management costs					(790)						(220)
Corporate management stock-based compensation					(1,409)						(278)

Income (loss) before income taxes					$	1,411					$	(2,748)

(1) Purchased services costs generally include contractor services, insurance expenditures, rental expense, and legal services.

(2)General administrative costs generally include office supplies, utilities, advertising, bad debt expense, and any restructuring expenditures.

Reconciliations of reportable depreciation and amortization and expenditures for long-lived assets to the Company’s consolidated totals are as follows for the periods presented:


	Three Months Ended March 31,
	2026				2025
	Depreciation/Amortization		Expenditures for Long-Lived Assets		Depreciation/Amortization		Expenditures for Long-Lived Assets
Rail, Technologies, and Services	$	693	$	274	$	1,168	$	427
Infrastructure Solutions	1,679		1,959		1,764		2,038
Reportable segments total	$	2,372	$	2,233	$	2,932	$	2,465
Corporate	523		727		495		110
Total	$	2,895	$	2,960	$	3,427	$	2,575

The following table summarizes the Company's total assets by reportable segment for the following periods:


	March 31, 2026		December 31, 2025
Rail, Technologies, and Services	$	145,709	$	155,552
Infrastructure Solutions	138,939		128,489

Reportable segments total	284,648		284,041
Corporate	49,135		46,331
Total	$	333,783	$	330,372

During the second quarter of 2025, the Company announced the discontinuation of its Automation and Materials Handling (“AMH”) product line which was reported in the Technology Services and Solutions business unit within the Rail segment. AMH had net sales of $407 for the three months ended March 31, 2025. The Company completed the remaining customer obligations in 2025, and all exit costs were incurred in the second quarter of 2025.

During the fourth quarter of 2025, the Company announced a restructuring program aligned with its strategy to reduce costs within the UK-based Technology Services and Solutions businesses within the Rail segment. The restructuring action has been completed as of December 31, 2025. The Company does not expect to incur additional material expenses associated with this program.

The following table sets forth a reconciliation of the beginning and ending restructuring liability balance for all programs through March 31, 2026:


	Restructuring Liability
Balance as of December 31, 2025	$	846

Cash paid	(270)

Balance as of March 31, 2026	$	576

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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+ Details

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 1,492	$ (2,117)
Adjustments to reconcile net income (loss) to cash used in operating activities:
Deferred income taxes	(174)	(766)
Depreciation	2,277	2,305
Amortization	618	1,122
Equity in income of nonconsolidated investments	0	(54)
Stock-based compensation	1,882	834
Change in operating assets and liabilities:
Accounts receivable	2,463	7,756
Contract assets	2,721	3,691
Inventories	(8,392)	(11,083)
Other current assets	(3,228)	(2,895)
Other noncurrent assets	1,544	(5,236)
Accounts payable	(8,152)	(12,649)
Deferred revenue	2,797	(129)
Accrued payroll and employee benefits	(4,747)	(10,129)
Other current liabilities	(454)	(2,613)
Other long-term liabilities	(1,085)	5,827
Net cash used in operating activities	(10,438)	(26,136)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures on property, plant, and equipment	(2,960)	(2,575)
Net cash used in investing activities	(2,960)	(2,575)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments of debt	(97,658)	(71,314)
Proceeds from debt	114,603	106,205
Treasury stock acquisitions	(3,846)	(6,071)
Net cash provided by financing activities	13,099	28,820
Effect of exchange rate changes on cash and cash equivalents	(58)	49
Net (decrease) increase in cash and cash equivalents	(357)	158
Cash and cash equivalents at beginning of period	4,348	2,454
Cash and cash equivalents at end of period	3,991	2,612
Supplemental disclosure of cash flow information:
Interest paid	822	1,010
Income taxes paid	$ 192	$ 341

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Unrealized loss on cash flow hedge, tax	$ 0	$ 0

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2026	Dec. 31, 2025
Statement of Financial Position [Abstract]
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares issued (in shares)	11,115,779	11,115,779
Common stock, shares outstanding (in shares)	10,326,247	10,135,410
Treasury stock shares - at cost, common stock (in shares)	789,532	980,369

Inventory (Tables)

3 Months Ended

Mar. 31, 2026

Inventory Disclosure [Abstract]

Schedule of Inventory

The Company’s components of inventory are summarized in the following table for the periods presented:


	March 31, 2026		December 31, 2025
Finished goods	$	37,430	$	29,754
Work-in-process	7,653		4,947
Raw materials	23,396		25,518
Inventories - net	$	68,479	$	60,219

Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2026

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table presents the changes in goodwill balance by reportable segment for the period presented:


	Rail, Technologies, and Services		Infrastructure Solutions		Total
Balance as of December 31, 2025	$	21,386	$	11,676	$	33,062


Foreign currency translation impact	(329)		—		(329)


Balance as of March 31, 2026	$	21,057	$	11,676	$	32,733

Schedule of Finite-Lived Intangible Assets

The following table sets forth the components of the Company’s intangible assets for the periods presented:


	March 31, 2026
	Weighted Average Amortization Period In Years	Gross Carrying Value		Accumulated Amortization		Net Carrying Amount

Patents	10	$	319	$	(207)	$	112
Customer relationships	12	28,592		(22,481)		6,111
Trademarks and trade names	13	8,024		(5,931)		2,093
Technology	7	32,770		(30,312)		2,458
Favorable lease	6	327		(200)		127
		$	70,032	$	(59,131)	$	10,901


	December 31, 2025
	Weighted Average Amortization Period In Years	Gross Carrying Value		Accumulated Amortization		Net Carrying Amount
Patents	10	$	324	$	(211)	$	113
Customer relationships	12	28,771		(22,331)		6,440
Trademarks and trade names	13	8,055		(5,818)		2,237
Technology	7	32,819		(30,224)		2,595
Favorable lease	6	327		(186)		141
		$	70,296	$	(58,770)	$	11,526

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References

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+ Details

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2026
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the three months ended March 31, 2026 and 2025, the Company recorded an income tax benefit of $81 and $631, respectively, on pre-tax income (loss) of $1,411 and ($2,748), respectively, for an effective income tax rate of (5.7%) and 23.0%, respectively. The Company's effective income tax rate for the three months ended March 31, 2026 differed from the federal statutory rate of 21% primarily due to the discrete impact of excess tax benefits related to share-based compensation, offset by the impact of pre-tax losses in the United Kingdom, for which no income tax benefit was recognized due to a valuation allowance. Changes in pre-tax income projections, combined with the seasonal nature of our businesses, also impact the effective income tax rate each quarter.

- Definition

The entire disclosure for income tax.

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+ Details

Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2026

Accounts Receivable Additional Disclosures [Abstract]

Schedule of Accounts Receivable, Allowance for Credit Loss

The following table sets forth the Company’s allowance for credit losses:


	Allowance for Credit Losses
Balance as of December 31, 2025	$	1,630
Current period provision	822
Write-off against allowance	(13)

Recoveries of previous write-offs	(522)
Balance as of March 31, 2026	$	1,917

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net loss	$ 1,492	$ (2,117)
Other comprehensive income, net of tax:
Foreign currency translation adjustment	(1,037)	103
Unrealized gain (loss) on cash flow hedges, net of tax expense of $0	5	(266)
Total comprehensive income (loss)	460	(2,280)
Less comprehensive income attributable to noncontrolling interest:
Net loss attributable to noncontrolling interest	(8)	(7)
Foreign currency translation adjustment	160	116
Amounts attributable to noncontrolling interest	152	109
Comprehensive income (loss) attributable to L.B. Foster Company	$ 308	$ (2,389)

Business Segments - Narrative (Details) $ in Thousands	3 Months Ended
Business Segments - Narrative (Details) $ in Thousands	Mar. 31, 2026 USD ($) segment	Mar. 31, 2025 USD ($)
Segment Reporting Information
Number of operating segments \| segment	2
Number of reportable segments \| segment	2
Total net sales \| $	$ 121,144	$ 97,792
AMH \| Automation and Materials Handling Line
Segment Reporting Information
Total net sales \| $		$ 407

- Definition

+ References

+ Details

Commitments and Contingent Liabilities	3 Months Ended
Commitments and Contingent Liabilities	Mar. 31, 2026
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	Commitments and Contingent Liabilities Product Liability Claims The Company is subject to product warranty claims that arise in the ordinary course of its business. For certain manufactured products, the Company maintains a product warranty accrual as a percentage of cost of sales. In addition, the product warranty accrual is adjusted periodically based on the identification or resolution of known individual product warranty claims. Other Legal Matters The Company is also subject to other legal proceedings and claims that arise in the ordinary course of its business. Legal actions are subject to inherent uncertainties, and future events could change management’s assessment of the probability or estimated amount of potential losses from pending or threatened legal actions. Based on available information, it is the opinion of management that the ultimate resolution of pending or threatened legal actions, both individually and in the aggregate, will not result in losses having a material adverse effect on the Company’s financial position or liquidity as of March 31, 2026. If management believes that, based on available information, it is at least reasonably possible that a material loss (or additional material loss in excess of any accrual) will be incurred in connection with any legal actions, the Company discloses an estimate of the possible loss or range of loss, either individually or in the aggregate, as appropriate, if such an estimate can be made, or discloses that an estimate cannot be made. Based on the Company’s assessment as of March 31, 2026, no such disclosures were considered necessary. Environmental and Legal Proceedings The Company is subject to national, state, foreign, provincial, and/or local laws and regulations relating to the protection of the environment. The Company’s efforts to comply with environmental regulations may have an adverse effect on its future earnings. On June 5, 2017, a General Notice Letter was received from the United States Environmental Protection Agency (“EPA”) indicating that the Company may be a potentially responsible party (“PRP”) regarding the Portland Harbor Superfund Site cleanup along with numerous other companies. More than 140 other companies received such a notice. The Company and a predecessor owned and operated a facility near the harbor site for a period prior to 1982. The net present value and undiscounted costs of the selected remedy throughout the harbor site are estimated by the EPA to be approximately $1.1 billion and $1.7 billion respectively, and the remedial work is expected to take as long as 13 years to complete. Other estimates indicate that these costs may increase given that the remedy will not be initiated or completed for several years. The Company is reviewing the basis for its identification by the EPA and the nature of the historic operations of a Company predecessor near the site. Additionally, the Company executed a PRP agreement which provides for a private allocation process among almost 100 PRPs in a working group whose work is ongoing and involves a process that will ultimately conclude a proposed allocation of liability for cleanup of the site and various sub-areas. The Company does not have any individual risk sharing agreements in place with respect to the site, and was only associated with the site from 1976 to when it purchased the stock of a company whose assets it sold in 1982 and which was dissolved in 1994. On March 26, 2020, the EPA issued a Unilateral Administrative Order to two parties requiring them to perform remedial design work for that portion of the Harbor Superfund Site that includes the area closest to the facility; the Company was not a recipient of this Unilateral Administrative Order. On December 2, 2024, the Company and many other PRPs received a Special Notice Letter ("SNL") from the EPA regarding a formal initiation of negotiations for the investigation and cleanup of the Portland Harbor Superfund Site and requesting a "good faith offer" from certain PRPs as to remediation and reimbursement of costs within 120 days, which, if accepted, would lead to a formal Consent Decree which may not be entered under the EPA's proposed schedule until fall of 2026 or by March 2027. The deadline for a response was extended to May 30, 2025, and the Company responded, along with other similarly-situated parties, in a timely manner. The Company cannot predict the ultimate impact of these proceedings and the SNLs because of the large number of PRPs involved throughout the harbor site, the size and extent of the site, the degree of contamination of various wastes, varying environmental impacts throughout the harbor site, the scarcity of data related to the facility once operated by the Company and a predecessor, potential comparative liability between the allocation parties and regarding non-participants, and the speculative nature of the remediation costs. Based upon information currently available, management does not believe that the Company’s alleged PRP status regarding the Portland Harbor Superfund Site or other compliance with the present environmental protection laws will have a material adverse effect on the financial condition, results of operations, cash flows, competitive position, or capital expenditures of the Company. As more information develops and the allocation process is completed, and given the resolution of factors like those described above, an unfavorable resolution could have a material adverse effect. As of March 31, 2026 and December 31, 2025, the Company maintained environmental reserves approximating $1,495 for all of its environmental liabilities.