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Note 11 - Federal and State Income Taxes - Income Tax Rate Reconciliation (Details) - USD ($)
 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
Income tax at the statutory federal rate, amount                 $ 4,975,000 $ 6,042,000 $ 11,876,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent                 34.00% 34.00% 34.00%
Impact of the Tax Cuts and Jobs Act, amount                 $ (29,255)
Impact of the Tax Cuts and Jobs Act, percent                 (199.90%)
Nondeductible expenses, amount                 $ 72,000 $ 130,000 $ 149,000
Nondeductible expenses, percent                 0.50% 0.70% 0.40%
State income taxes/other—net of federal benefit, amount                 $ (60,000) $ 499,000 $ 1,467,000
State income taxes/other—net of federal benefit, percent                 (0.50%) 2.80% 4.20%
Total income tax (benefit) expense $ 28,895,000 $ (2,169,000) $ (1,004,000) $ (1,454,000) $ (270,000) $ (2,152,000) $ (2,442,000) $ (1,807,000) $ (24,268,000) $ 6,671,000 $ 13,492,000
Total income tax (benefit) expense, percent                 (165.90%) 37.50% 38.60%