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Note 9 - Net Income Per Common Share - Net Income Per Common Share Calculation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Basic:        
Net income available to common shareholders $ 24,145 $ 20,759 $ 47,467 $ 39,997
Average common shares outstanding (in shares) 33,588,000 33,367,000 33,554,000 32,231,000
Basic net income per common share (in dollars per share) $ 0.72 $ 0.62 $ 1.41 $ 1.24
Diluted:        
Net income available to common shareholders $ 24,145 $ 20,759 $ 47,467 $ 39,997
Average common shares outstanding (in shares) 33,588,000 33,367,000 33,554,000 32,231,000
Adjustment for common share equivalents (in shares) 595,000 631,000 592,000 664,000
Average common shares outstanding-diluted (in shares) 34,183,000 33,998,000 34,146,000 32,895,000
Diluted net income per common share (in dollars per share) $ 0.71 $ 0.61 $ 1.39 $ 1.22
Anti-dilutive shares (in shares) 6,500 13,000 6,500 13,000