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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net income, as reported $ 5,957 $ 10,179 $ 12,725 $ 12,260 $ 14,286 $ 10,634 $ 30,435 $ 9,561 $ 41,121 $ 64,916 $ 46,209
Weighted average common shares outstanding (in shares) 29,045 29,120 29,135 29,019 28,850 28,861 29,022 29,097 29,080 28,957 29,106
Weighted average common stock equivalents (in shares)                 2 13 20
Total weighted average common shares outstanding and common stock equivalents (in shares) 29,046 29,120 29,136 29,023 28,860 28,875 29,034 29,111 29,082 28,970 29,126
Basic earnings per common share (in dollars per share) $ 0.21 $ 0.35 $ 0.44 $ 0.42 $ 0.50 $ 0.37 $ 1.05 $ 0.33 $ 1.41 $ 2.24 $ 1.59
Diluted earnings per common share (in dollars per share) $ 0.21 $ 0.35 $ 0.44 $ 0.42 $ 0.50 $ 0.37 $ 1.05 $ 0.33 $ 1.41 $ 2.24 $ 1.59
Dividend Payout ratio                 51.10% 30.40% 40.30%