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Earnings Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2021
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, 2021 and 2020:
|  | Year Ended December 31,
|  | 2021 |  | 2020 |  |
Numerator for basic and diluted earnings (loss) per common share: |  |  |  |  |  |
Income from continuing operations attributable to L.B. Foster Company |  | $ | 3,554 |  |  | $ | 25,823 |  |  |
Income (loss) from discontinued operations |  | 72 |  |  | (18,241) |  |  |
Net income attributable to L.B. Foster Company |  | $ | 3,626 |  |  | $ | 7,582 |  |  |
Denominator: |  |  |  |  |  |
Weighted average shares outstanding |  | 10,623 |  |  | 10,540 |  |  |
Denominator for basic earnings per common share |  | 10,623 |  |  | 10,540 |  |  |
Effect of dilutive securities: |  |  |  |  |  |
Stock compensation plans |  | 129 |  |  | 131 |  |  |
Dilutive potential common shares |  | 129 |  |  | 131 |  |  |
Denominator for diluted earnings per common share - adjusted weighted average shares outstanding and assumed conversions |  | 10,752 |  |  | 10,671 |  |  |
Basic earnings from continuing operations per common share |  | $ | 0.33 |  |  | $ | 2.45 |  |  |
Basic earnings (loss) from discontinued operations per common share |  | 0.01 |  |  | (1.73) |  |  |
Basic earnings per common share |  | $ | 0.34 |  |  | $ | 0.72 |  |  |
Diluted earnings from continuing operations per common share |  | $ | 0.33 |  |  | $ | 2.42 |  |  |
Diluted earnings (loss) from discontinued operations per common share |  | 0.01 |  |  | (1.71) |  |  |
Diluted earnings per common share |  | $ | 0.34 |  |  | $ | 0.71 |  |  |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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