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Note 3 - Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Net Income $ 9,561 $ 8,733
Divided by:    
Weighted average common shares outstanding (in shares) 29,097 29,397
Weighted average common stock equivalents (in shares) 14 22
Total weighted average common shares outstanding and common stock equivalents (in shares) 29,111 29,419
Basic earnings per common share (in dollars per share) $ 0.33 $ 0.30
Diluted earnings per common share (1) (in dollars per share) [1] $ 0.33 $ 0.30
Dividend payout ratio 51.50% 53.30%
[1] For the three months ended March 31, 2016 and 2015, there were no stock options that were anti-dilutive.