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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Net Income $ 10,634 $ 11,008 $ 50,630 $ 34,575
Divided by:        
Weighted average common shares outstanding (in shares) 28,861 28,927 28,993 29,188
Weighted average common stock equivalents (in shares) 14 19 13 21
Total weighted average common shares outstanding and common stock equivalents (in shares) 28,875 28,946 29,006 29,209
Basic earnings per common share (in dollars per share) $ 0.37 $ 0.38 $ 1.75 $ 1.18
Diluted earnings per common share (in dollars per share) [1] $ 0.37 $ 0.38 $ 1.75 $ 1.18
Dividend payout ratio 45.90% 42.10% 29.10% 40.70%
[1] For the three and nine months ended September 30, 2016 and 2015, there were no stock options that were anti-dilutive.