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Note 1 - Basis of Presentation - Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Net income available to common shareholders $ 28,852 $ 23,429 $ 74,037 $ 69,819
Average common shares outstanding (in shares) 32,214 30,621 31,797 30,434
Average potential dilutive common shares (in shares) 210 223 210 223
Average diluted common shares (in shares) 32,424 30,844 32,007 30,657
Basic earnings per share (in dollars per share) $ 0.90 $ 0.77 $ 2.33 $ 2.29
Diluted earnings per share (1) (in dollars per share) [1] $ 0.89 $ 0.76 $ 2.31 $ 2.28
[1] Stock options to purchase 3,305 and 61,395 shares for the three and nine months ended September 30, 2016 were not included in the diluted EPS calculation because the exercise price of those options exceeded the average market price for each period. There were no stock options excluded from the earnings per share calculation due to the related exercise price exceeding the average market price for the three and nine months ended September 30, 2017.