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Earnings Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2024
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 periods indicated:
|  | Three Months Ended March 31, |  |
|  | 2024 |  | 2023 |  |  |  |
Numerator for basic and diluted earnings (loss) per common share: |  |  |  |  |  |  |  |
Net income (loss) attributable to L.B. Foster Company |  | $ | 4,436 |  |  | $ | (2,152) |  |  |  |  |
Denominator: |  |  |  |  |  |  |  |
Weighted average shares outstanding |  | 10,762 |  |  | 10,792 |  |  |  |  |
Denominator for basic earnings (loss) per common share |  | 10,762 |  |  | 10,792 |  |  |  |  |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Stock compensation plans |  | 223 |  |  | — |  |  |  |  |
Dilutive potential common shares |  | 223 |  |  | — |  |  |  |  |
Denominator for diluted earnings (loss) per common share - adjusted weighted average shares outstanding |  | 10,985 |  |  | 10,792 |  |  |  |  |
Basic earnings (loss) per common share |  | $ | 0.41 |  |  | $ | (0.20) |  |  |  |  |
Diluted earnings (loss) per common share |  | $ | 0.40 |  |  | $ | (0.20) |  |  |  |  |

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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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