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Note 9 - Net Income Per Common Share - Net Income Per Common Share Calculation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Basic:    
Net income available to common shareholders $ 23,322 $ 19,238
Average common shares outstanding (in shares) 33,519 31,083
Basic net income per common share (in dollars per share) $ 0.70 $ 0.62
Diluted:    
Net income available to common shareholders $ 23,322 $ 19,238
Average common shares outstanding (in shares) 33,519 31,083
Adjustment for common share equivalents (in shares) 585 693
Average common shares outstanding-diluted (in shares) 34,104 31,776
Diluted net income per common share (in dollars per share) $ 0.68 $ 0.61
Anti-dilutive shares (in shares) 5 13