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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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator for basic and diluted earnings per share – Net income available to common shareholders $ 69,399 $ 33,939 $ 172,776 $ 73,862
Denominator for basic earnings per share – weighted average shares outstanding (in shares) 56,007 55,033 55,882 54,734
Effect of dilutive securities– Employee and director stock options and restricted share awards (in shares) 1,799 1,410 1,952 1,195
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions (in shares) 57,806 56,443 57,834 55,929
Basic earnings per common share (in dollars per share) $ 1.24 $ 0.62 $ 3.09 $ 1.35
Diluted earnings per common share and common share equivalents (in dollars per share) $ 1.20 $ 0.60 $ 2.99 $ 1.32