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Note 3 - Earnings Per Common Share - Computation of Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Net income available to common stockholders $ 15,652 $ 19,898 $ 48,895 $ 63,203
Earnings allocated to participating securities (44) (63) (133) (160)
Income attributable to common stock $ 15,608 $ 19,835 $ 48,762 $ 63,043
Weighted average common shares outstanding, including participating securities (in shares) 38,427 38,817 38,377 39,020
Weighted average participating securities (in shares) (108) (123) (104) (99)
Weighted average common shares outstanding (in shares) 38,319 38,694 38,273 38,921
Incremental shares from assumed conversions of options, performance units and restricted shares (in shares) 206 135 185 135
Weighted average common and equivalent shares outstanding (in shares) 38,525 38,829 38,458 39,056
Earnings per common share:        
Basic (in dollars per share) $ 0.41 $ 0.51 $ 1.27 $ 1.62
Diluted (in dollars per share) $ 0.41 $ 0.51 $ 1.27 $ 1.61