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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
Mar. 31, 2018
Mar. 31, 2017
Net Income $ 11,412 $ 12,260
Divided by:    
Weighted average common shares outstanding (in shares) 28,974 29,019
Weighted average common stock equivalents (in shares) 1 4
Total weighted average common shares outstanding and common stock equivalents (in shares) 28,975 29,023
Basic earnings per common share (in dollars per share) $ 0.39 $ 0.42
Diluted earnings per common share (in dollars per share) [1] $ 0.39 $ 0.42
Dividend payout ratio 51.30% 42.90%
[1] For the three months ended March 31, 2018 and 2017, there were no stock options that were anti-dilutive.