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Note 15 - Net Income per Common Share (Details) - Net Income per Common Share Calculation - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Basic:                              
Net income available to common shareholders (in Dollars) $ 22,286 $ 21,283 $ 20,759 $ 19,238 $ 14,547 $ 13,937 $ 12,802 $ 12,358 $ 11,862 $ 11,615 $ 11,533 $ 11,431 $ 83,566 $ 53,644 $ 46,441
Average common shares outstanding                         32,836 26,684 25,726
Basic net income per common share (in Dollars per share) $ 0.67 [1] $ 0.64 [1] $ 0.62 [1] $ 0.62 [1] $ 0.51 [1] $ 0.54 [1] $ 0.49 [1] $ 0.48 [1] $ 0.46 [1],[2] $ 0.45 [1],[2] $ 0.45 [1],[2] $ 0.45 [1],[2] $ 2.54 $ 2.01 $ 1.81
Diluted:                              
Net income available to common shareholders (in Dollars) $ 22,286 $ 21,283 $ 20,759 $ 19,238 $ 14,547 $ 13,937 $ 12,802 $ 12,358 $ 11,862 $ 11,615 $ 11,533 $ 11,431 $ 83,566 $ 53,644 $ 46,441
Average common shares outstanding                         32,836 26,684 25,726
Adjustment for common share equivalents                         643 867 633
Average common shares outstanding-diluted                         33,479 27,551 26,359
Diluted net income per common share (in Dollars per share) $ 0.65 [1] $ 0.63 [1] $ 0.61 [1] $ 0.61 [1] $ 0.49 [1] $ 0.52 [1] $ 0.48 [1] $ 0.47 [1] $ 0.45 [1],[2] $ 0.44 [1],[2] $ 0.44 [1],[2] $ 0.44 [1],[2] $ 2.50 $ 1.95 $ 1.76
Anti-dilutive shares                         5 13 35
[1] Earnings per common share are calculated on a quarterly basis and may not be additive to the year to date amount.
[2] Per share amounts have been adjusted to give effect to the 10% common stock dividend paid on June 14, 2013.