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Note 11 - Federal and State Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current:                      
Federal                 $ (225) $ 98 $ 814
State                 238 493 395
Total current income tax provision                 13 591 1,209
Deferred:                      
Federal                 5,506 10,782 6,111
State                 1,152 2,119 1,401
Total deferred income tax provision                 6,658 12,901 7,512
Total income tax expense $ (270) $ (2,152) $ (2,442) $ (1,807) $ (2,048) $ (3,567) $ (4,471) $ (3,406) $ 6,671 $ 13,492 $ 8,721