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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Federal, current |  | $ (7,780) | $ 11,951
Federal, deferred | 14,117 | (28,055) | (2,925)
State, current | 1,410 | (1,737) | 1,811
State, deferred | (20) | 5,430 | (451)
Actual income tax expense | $ 15,507 | $ (32,142) | $ 10,386

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