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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current tax expense (benefit): |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 7,201 | $ 14,509 | $ 13,634
State |  |  |  |  |  |  |  |  | 1,233 | 926 | 675
Total current tax expense |  |  |  |  |  |  |  |  | 8,434 | 15,435 | 14,309
Deferred tax expense (benefit): |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 296 | 5,205 | (1,480)
State |  |  |  |  |  |  |  |  | 52 | (12) | (10)
Total deferred tax expense (benefit) |  |  |  |  |  |  |  |  | 348 | 5,193 | (1,490)
Total income tax expense | $ 2,596 | $ 1,118 | $ 2,500 | $ 2,568 | $ 10,720 | $ 3,894 | $ 2,959 | $ 3,055 | $ 8,782 | $ 20,628 | $ 12,819

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