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Note 8 - Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Federal, current | $ (1,174) |  | $ (7,780)
Federal, deferred | 3,976 | 14,117 | (28,055)
State, current | 1,077 | 1,410 | (1,737)
State, deferred | (415) | (20) | 5,430
Income tax expense (benefit) | $ 3,464 | $ 15,507 | $ (32,142)

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