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Earnings Per Common Share | 9 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Earnings Per Common Share | Earnings Per Common Share (Share amounts in thousands) The following table sets forth the computation of basic and diluted earnings per common share for the periods indicated:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Numerator for basic and diluted earnings per common share: |  |  |  |  |  |  |  |
Net income attributable to L.B. Foster Company |  | $ | 4,354 |  |  | $ | 35,905 |  |  | $ | 5,129 |  |  | $ | 43,188 |
Denominator: |  |  |  |  |  |  |  |
Weighted average shares outstanding |  | 10,356 |  |  | 10,718 |  |  | 10,444 |  |  | 10,757 |
Denominator for basic earnings per common share |  | 10,356 |  |  | 10,718 |  |  | 10,444 |  |  | 10,757 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Stock compensation plans |  | 524 |  |  | 274 |  |  | 479 |  |  | 302 |
Dilutive potential common shares |  | 524 |  |  | 274 |  |  | 479 |  |  | 302 |
Denominator for diluted earnings per common share - adjusted weighted average shares outstanding |  | 10,880 |  |  | 10,992 |  |  | 10,923 |  |  | 11,059 |
Basic earnings per common share |  | $ | 0.42 |  |  | $ | 3.35 |  |  | $ | 0.49 |  |  | $ | 4.01 |
Diluted earnings per common share |  | $ | 0.40 |  |  | $ | 3.27 |  |  | $ | 0.47 |  |  | $ | 3.91 |

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