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Note 1 - Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net income available to common shareholders $ 92,940 $ 96,790 $ 74,107
Average common shares outstanding (in shares) 69,385 61,291 56,168
Average potential dilutive common shares (in shares) 468 636 252
Average diluted common shares (in shares) 69,853 61,927 56,420
Basic earnings per share (in dollars per share) [1] $ 1.34 $ 1.58 $ 1.32
Diluted earnings per share (in dollars per share) [1] $ 1.33 $ 1.56 $ 1.31
[1] All per share amounts have been restated to reflect the effect of the two-for-one stock split on February 8, 2018.