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Note 15 - Income Taxes - Components of Income Tax Provision (Details) - USD ($)
$ 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
Current tax expense (benefit):                      
Federal                 $ 14,509 $ 13,634 $ (254)
State                 926 675 581
Total current tax expense                 15,435 14,309 327
Deferred tax expense (benefit):                      
Federal                 5,205 (1,480) 10,034
State                 (12) (10) 1,020
Total deferred tax expense (benefit)                 5,193 (1,490) 11,054
Total income tax expense $ 10,720 $ 3,894 $ 2,959 $ 3,055 $ 3,638 $ 3,230 $ 3,022 $ 2,929 $ 20,628 $ 12,819 $ 11,381