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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 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Net income available to common stockholders $ 31,047 $ 27,406 $ 30,849 $ 29,872 $ 31,321 $ 32,097 $ 32,219 $ 32,999 $ 119,174 $ 128,636 $ 71,289
Earnings allocated to participating securities                 (287) (313) (356)
Income attributable to common stock                 $ 118,887 $ 128,323 $ 70,933
Weighted average common shares outstanding, including participating securities (in shares)                 39,355 39,723 39,643
Weighted average participating securities (in shares)                 (95) (97) (131)
Weighted average common shares outstanding (in shares)                 39,260 39,626 39,512
Incremental shares from assumed conversions of options, deferred stock units, performance units and restricted stock (in shares)                 216 260 132
Weighted average common and equivalent shares outstanding (in shares)                 39,476 39,886 39,644
Basic (in dollars per share) $ 0.79 $ 0.70 $ 0.78 $ 0.76 $ 0.79 $ 0.81 $ 0.81 $ 0.83 $ 3.03 $ 3.24 $ 1.80
Diluted (in dollars per share) $ 0.79 $ 0.70 $ 0.78 $ 0.75 $ 0.79 $ 0.80 $ 0.81 $ 0.82 $ 3.01 $ 3.22 $ 1.79