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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Basic:        
Net income available to common shareholders $ 24,523 $ 21,283 $ 71,990 $ 61,280
Average common shares outstanding (in shares) 33,591 33,401 33,566 32,625
Basic net income per common share (in dollars per share) $ 0.73 $ 0.64 $ 2.14 $ 1.88
Diluted:        
Net income available to common shareholders $ 24,523 $ 21,283 $ 71,990 $ 61,280
Average common shares outstanding (in shares) 33,591 33,401 33,566 32,625
Adjustment for common share equivalents (in shares) 598 625 596 653
Average common shares outstanding-diluted (in shares) 34,189 34,026 34,162 33,278
Diluted net income per common share (in dollars per share) $ 0.72 $ 0.63 $ 2.11 $ 1.84
Anti-dilutive shares (in shares) 8 8 11