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Note 11 - Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2015
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 59,433 | $ 28,788 | $ 31,587 |
State |  |  |  |  |  |  |  |  | 28,278 | 22,364 | 26,396 |
Total Current |  |  |  |  |  |  |  |  | 87,711 | 51,152 | 57,983 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 31,818 | 11,775 | 3,738 |
State |  |  |  |  |  |  |  |  | 2,736 | 4,174 | (1,734) |
Total Deferred |  |  |  |  |  |  |  |  | 34,554 | 15,949 | 2,004 |
Total income tax expense | $ 51,166 | $ 35,163 | $ 15,431 | $ 20,505 | $ 16,345 | $ 15,808 | $ 12,273 | $ 22,675 | $ 122,265 | $ 67,101 | $ 59,987 | $ 59,987

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