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Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | The following table sets forth the computation of basic and diluted earnings (loss) per common share for the years ended December 31, 2023 and 2022:
|  | Year Ended December 31,
|  | 2023 |  | 2022 |  |
Numerator for basic and diluted earnings (loss) per common share: |  |  |  |  |  |
Net income (loss) attributable to L.B. Foster Company |  | $ | 1,464 |  |  | $ | (45,564) |  |  |
Denominator: |  |  |  |  |  |
Weighted average shares outstanding |  | 10,799 |  |  | 10,720 |  |  |
Denominator for basic earnings per common share |  | 10,799 |  |  | 10,720 |  |  |
Effect of dilutive securities: |  |  |  |  |  |
Stock compensation plans |  | 196 |  |  | — |  |  |
Dilutive potential common shares |  | 196 |  |  | — |  |  |
Denominator for diluted earnings per common share - adjusted weighted average shares outstanding and assumed conversions |  | 10,995 |  |  | 10,720 |  |  |
Basic earnings (loss) per common share |  | $ | 0.14 |  |  | $ | (4.25) |  |  |
Diluted earnings (loss) per common share |  | $ | 0.13 |  |  | $ | (4.25) |  |  |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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