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Note 2 - Earnings Per Common Share - Computation of Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Net income available to common stockholders $ 19,885 $ 30,849 $ 43,305 $ 60,721
Earnings allocated to participating securities (53) (70) (98) (150)
Income attributable to common stock $ 19,832 $ 30,779 $ 43,207 $ 60,571
Weighted average common shares outstanding, including participating securities (in shares) 39,078 39,379 39,127 39,469
Weighted average participating securities (in shares) (104) (89) (88) (98)
Weighted average common shares outstanding (in shares) 38,974 39,290 39,039 39,371
Incremental shares from assumed conversions of options, performance units and restricted shares (in shares) 43 176 135 225
Weighted average common and equivalent shares outstanding (in shares) 39,017 39,466 39,174 39,596
Earnings per common share:        
Basic (in dollars per share) $ 0.51 $ 0.78 $ 1.11 $ 1.54
Diluted (in dollars per share) $ 0.51 $ 0.78 $ 1.10 $ 1.53