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Note 10 - Income Taxes - Income Tax Provisions (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
Federal: |  |  |  |  |  |  |  |  |  |  |
Federal tax provision, current |  |  |  |  |  |  |  |  | $ 14,859 | $ 34,996 | $ 25,319
Federal tax provision, deferred |  |  |  |  |  |  |  |  | 7,985 | (1,416) | (3,476)
Total federal tax provision |  |  |  |  |  |  |  |  | 22,844 | 33,580 | 21,843
State and Local: |  |  |  |  |  |  |  |  |  |  |
State and local tax provision, current |  |  |  |  |  |  |  |  | 1,419 | 7,647 | 7,059
State and local tax provision, deferred |  |  |  |  |  |  |  |  | 750 | (124) | (1,735)
Total state and local tax provision |  |  |  |  |  |  |  |  | 2,169 | 7,523 | 5,324
Total income tax provision | $ 7,693 | $ 5,291 | $ 6,775 | $ 5,254 | $ 8,116 | $ 6,655 | $ 20,717 | $ 5,615 | $ 25,013 | $ 41,103 | $ 27,167

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