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Note 10 - Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Federal, current | $ 63 | $ (2,040) | $ (437)
Federal, deferred | (2,391) | 3,976 | 14,117
State, current | 2,349 | 828 | 1,284
State, deferred | (2,825) | (415) | (20)
Income tax (benefit) expense | $ (2,804) | $ 2,349 | $ 14,944

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