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Note 8 - Net Income Per Common Share (Details) - Net Income Per Common Share Calculation - 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
Basic:        
Net income available to common shareholders (in Dollars) $ 20,759 $ 12,802 $ 39,997 $ 25,160
Average common shares outstanding 33,367 25,982 32,231 25,955
Basic net income per common share (in Dollars per share) $ 0.62 $ 0.49 $ 1.24 $ 0.97
Diluted:        
Adjustment for common share equivalents 631 647 664 645
Average common shares outstanding-diluted 33,998 26,629 32,895 26,600
Diluted net income per common share (in Dollars per share) $ 0.61 $ 0.48 $ 1.22 $ 0.95
Anti-dilutive shares 13 21 13 21