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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Numerator for basic and diluted earnings per share – Net income available to common shareholders $ 16,816 $ 41,621 $ 39,923 $ 78,725
Denominator for basic earnings per share – weighted average shares outstanding (in shares) 36,291 36,852 36,387 36,847
Employee stock options and restricted stock awards (in shares) 609 843 726 917
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions (in shares) 36,900 37,695 37,113 37,764
Basic earnings per common share (in dollars per share) $ 0.46 $ 1.13 $ 1.10 $ 2.14
Diluted earnings per common share and common share equivalents (in dollars per share) $ 0.46 $ 1.10 $ 1.08 $ 2.08