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Note 3 - Earnings Per Share - Earnings Per Share Calculation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Numerator for basic and diluted earnings per share – Net income available to common shareholders $ 90,455 $ 92,453
Denominator for basic earnings per share – weighted average shares outstanding (in shares) 54,767 55,938
Effect of dilutive securities– Employee stock options and restricted share awards (in shares) 1,797 1,974
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions (in shares) 56,564 57,912
Basic earnings per common share (in dollars per share) $ 1.65 $ 1.65
Diluted earnings per common share and common share equivalents (in dollars per share) $ 1.60 $ 1.60