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Note 3 - Earnings Per Share (Details) - Earnings Per Common Share - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Common Share [Abstract]        
Net income, as reported (in Dollars) $ 14,834 $ 11,685 $ 23,567 $ 21,981
Divided by:        
Weighted average common shares outstanding 29,246 30,059 29,321 30,022
Weighted average common stock equivalents 22 31 22 34
Total weighted average common shares outstanding and common stock equivalents 29,268 30,090 29,343 30,056
Basic earnings per common share (in Dollars per share) $ 0.51 $ 0.39 $ 0.80 $ 0.73
Diluted earnings per common share (1) (in Dollars per share) [1] $ 0.51 $ 0.39 $ 0.80 $ 0.73
Dividend payout ratio 31.40% 38.50% 40.00% 41.10%
[1] For the three and six months ended June 30, 2015 and 2014, there were no stock options that were anti-dilutive.