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Note 15 - Net Income Per Common Share - Net Income Per Common Share Calculation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Basic:                              
Net income available to common shareholders $ 25,717 $ 24,523 $ 24,145 $ 23,322 $ 22,286 $ 21,283 $ 20,759 $ 19,238 $ 14,547 $ 13,937 $ 12,802 $ 12,358 $ 97,707 $ 83,566 $ 53,644
Average common shares outstanding (in shares)                         33,587 32,836 26,684
Basic net income per common share (in dollars per share) $ 0.76 [1] $ 0.73 [1] $ 0.72 [1] $ 0.70 [1] $ 0.67 [1] $ 0.64 [1] $ 0.62 [1] $ 0.62 [1] $ 0.51 [1] $ 0.54 [1] $ 0.49 [1] $ 0.48 [1] $ 2.91 $ 2.54 $ 2.01
Diluted:                              
Net income available to common shareholders $ 25,717 $ 24,523 $ 24,145 $ 23,322 $ 22,286 $ 21,283 $ 20,759 $ 19,238 $ 14,547 $ 13,937 $ 12,802 $ 12,358 $ 97,707 $ 83,566 $ 53,644
Average common shares outstanding (in shares)                         33,587 32,836 26,684
Adjustment for common share equivalents (in shares)                         594 643 867
Average common shares outstanding-diluted (in shares)                         34,181 33,479 27,551
Diluted net income per common share (in dollars per share) $ 0.75 [1] $ 0.72 [1] $ 0.71 [1] $ 0.68 [1] $ 0.65 [1] $ 0.63 [1] $ 0.61 [1] $ 0.61 [1] $ 0.49 [1] $ 0.52 [1] $ 0.48 [1] $ 0.47 [1] $ 2.86 $ 2.50 $ 1.95
Anti-dilutive shares (in shares)                         7 5 13
[1] Earnings per common share are calculated on a quarterly basis and may not be additive to the year to date amount.