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Earnings Per Common Share (Tables)
 12 Months Ended
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,
20212020
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 operations72 (18,241)
Net income attributable to L.B. Foster Company$3,626 $7,582 
Denominator:
Weighted average shares outstanding10,623 10,540 
Denominator for basic earnings per common share10,623 10,540 
Effect of dilutive securities:
Stock compensation plans129 131 
Dilutive potential common shares129 131 
Denominator for diluted earnings per common share - adjusted weighted average shares outstanding and assumed conversions10,752 10,671 
Basic earnings from continuing operations per common share$0.33 $2.45 
Basic earnings (loss) from discontinued operations per common share0.01 (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 share0.01 (1.71)
Diluted earnings per common share$0.34 $0.71