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Note 4 - Earnings Per Share - Earnings Per Share Calculation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Numerator for basic and diluted earnings per share – Net income available to common shareholders $ 92,453 $ 45,333
Basic (in shares) 55,938 55,567
Effect of dilutive securities– Employee stock options and restricted share awards (in shares) 1,974 2,167
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions (in shares) 57,912 57,734
Basic earnings per common share (in dollars per share) $ 1.65 $ 0.82
Diluted earnings per common share and common share equivalents (in dollars per share) $ 1.60 $ 0.79