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Note 3 - Earnings Per Share - Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Net Income $ 12,725 $ 30,435 $ 24,985 $ 39,996
Divided by:        
Weighted average common shares outstanding (in shares) 29,135 29,022 29,077 29,059
Weighted average common stock equivalents (in shares) 1 12 3 14
Total weighted average common shares outstanding and common stock equivalents (in shares) 29,136 29,034 29,080 29,073
Basic earnings per common share (in dollars per share) $ 0.44 $ 1.05 $ 0.86 $ 1.38
Diluted earnings per common share (in dollars per share) [1] $ 0.44 $ 1.05 $ 0.86 $ 1.38
Dividend payout ratio 40.90% 16.20% 41.90% 24.60%
[1] For the three and six months ended June 30, 2017 and 2016, there were no stock options that were anti-dilutive.