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Note 12 - Federal and State Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current:                      
Federal                 $ (62) $ (56) $ (48)
State                 282 646 189
Total current income tax provision                 220 590 141
Deferred:                      
Federal                 4,860 2,177 6,185
State                 502 (552) 1,021
Total deferred income tax provision                 5,362 1,625 7,206
Total income tax provision expense $ 4,713 $ 1,769 $ (402) $ (498) $ (4,168) $ 1,264 $ 2,301 $ 2,818 $ 5,582 $ 2,215 $ 7,347