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Note 12 - Federal and State Income Taxes - Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 21, 2017 | 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
Income tax at the statutory federal rate, amount |  |  |  |  |  |  |  |  |  |  | $ 2,124 | $ 6,582 | $ 4,975
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 35.00% |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 34.00%
Impact of the Tax Cuts and Jobs Act, amount | [1] |  |  |  |  |  |  |  |  |  |  |  | $ (29,255)
Impact of the Tax Cuts and Jobs Act, percent | [1] |  |  |  |  |  |  |  |  |  |  |  | (199.90%)
Nondeductible expenses, amount |  |  |  |  |  |  |  |  |  |  | $ 342 | $ 80 | $ 72
Nondeductible expenses, percent |  |  |  |  |  |  |  |  |  |  | 3.40% | 0.20% | 0.50%
State income taxes/other—net of federal benefit, amount |  |  |  |  |  |  |  |  |  |  | $ (251) | $ 685 | $ (60)
State income taxes/other—net of federal benefit, percent |  |  |  |  |  |  |  |  |  |  | (2.50%) | 2.20% | (0.50%)
Total income tax provision (benefit) expense |  |  | $ (4,168) | $ 1,264 | $ 2,301 | $ 2,818 | $ 1,883 | $ 3,129 | $ 2,005 | $ 330 | $ 2,215 | $ 7,347 | $ (24,268)
Total income tax (benefit) expense, percent |  |  |  |  |  |  |  |  |  |  | 21.90% | 23.40% | (165.90%)
[1] | On December 22, 2017, the Tax Cuts and Jobs Act (the &#8220;Act&#8221;) was signed into law. The Act included numerous changes to existing tax law, including a permanent reduction in the federal corporate income tax rate from 35% to 21% effective January 1, 2018 and repeal of the alternative minimum tax (&#8220;AMT&#8221;) allowing a refund of existing AMT carryovers during the years 2018 through 2021. As a result, the Company recorded a tax benefit of $29.3 million in the fourth quarter of 2017 related to the revaluation of its net deferred tax liabilities.

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