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Note 2 - Earnings per Common Share - Basic and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Net income $ 7,889 $ 9,646 $ 21,874 $ 22,502 $ 17,535 $ 44,376
Basic earnings per common share - weighted-average shares (in shares) 81,381   81,263   81,365 81,236
Effect of dilutive stock options (in shares) 65   149   77 158
Diluted earnings per common share - weighted-average shares and assumed conversions (in shares) 81,446   81,412   81,442 81,394
Basic earnings per common share (in dollars per share) $ 0.1   $ 0.27   $ 0.22 $ 0.55
Diluted earnings per common share (in dollars per share) $ 0.1   $ 0.27   $ 0.22 $ 0.55