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Note 6 - Earnings per Common Share - Basic and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Numerator:      
Net income $ 26,922 $ 70,373 $ 110,354
Denominator:      
Basic earnings per common share - weighted-average shares (in shares) 81,406 81,272 81,692
Effect of dilutive stock options (in shares) 66 141 267
Diluted earnings per common share - weighted-average shares and assumed conversions (in shares) 81,472 81,413 81,959
Basic earnings per common share (in dollars per share) $ 0.33 $ 0.87 $ 1.35
Diluted earnings per common share (in dollars per share) $ 0.33 $ 0.86 $ 1.35