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Note 15 - Income Taxes - Components of Income Tax Provision (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Federal |  |  |  |  |  |  |  |  | $ 9,603 | $ 7,201 | $ 14,509
State |  |  |  |  |  |  |  |  | 1,554 | 1,233 | 926
Total current tax expense |  |  |  |  |  |  |  |  | 11,157 | 8,434 | 15,435
Federal |  |  |  |  |  |  |  |  | (152) | 296 | 5,205
State |  |  |  |  |  |  |  |  | (11) | 52 | (12)
Total deferred tax expense (benefit) |  |  |  |  |  |  |  |  | (163) | 348 | 5,193
Total income tax expense | $ 2,833 | $ 2,580 | $ 2,951 | $ 2,630 | $ 2,596 | $ 1,118 | $ 2,500 | $ 2,568 | $ 10,994 | $ 8,782 | $ 20,628

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