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Note 2 - Summary of Significant Accounting Policies - Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net income, as reported $ 12,422 $ 17,333 $ 13,923 $ 11,412 $ 5,957 $ 10,179 $ 12,725 $ 12,260 $ 55,090 $ 41,121 $ 64,916
Weighted average common shares outstanding (in shares) 28,422 28,604 28,845 28,974 29,045 29,120 29,135 29,019 28,709 29,080 28,957
Weighted average common stock equivalents (in shares)                 1 2 13
Total weighted average common shares outstanding and common stock equivalents (in shares) 28,423 28,604 28,846 28,975 29,046 29,120 29,136 29,023 28,710 29,082 28,970
Basic earnings per common share (in dollars per share) $ 0.44 $ 0.61 $ 0.48 $ 0.39 $ 0.21 $ 0.35 $ 0.44 $ 0.42 $ 1.92 $ 1.41 $ 2.24
Diluted earnings per common share (in dollars per share) $ 0.44 $ 0.61 $ 0.48 $ 0.39 $ 0.21 $ 0.35 $ 0.44 $ 0.42 $ 1.92 $ 1.41 $ 2.24
Dividend Payout ratio                 41.70% 51.10% 30.40%