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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator for basic and diluted earnings per share – Net income available to common shareholders $ 58,044 $ 16,816 $ 103,377 $ 39,923
Denominator for basic earnings per share – weighted average shares outstanding (in shares) 56,009 54,436 55,819 54,581
Effect of dilutive securities – Employee stock options and restricted stock awards (in shares) 1,947 915 2,027 1,089
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions (in shares) 57,956 55,351 57,846 55,670
Basic earnings per common share (in dollars per share) $ 1.04 $ 0.31 $ 1.85 $ 0.73
Diluted earnings per common share and common share equivalents (in dollars per share) $ 1.00 $ 0.30 $ 1.79 $ 0.72