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Note 13 - Federal and State Income Taxes - Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 21, 2017 | 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
Income tax at the statutory federal rate, amount |  |  |  |  |  |  |  |  |  |  | $ 6,582 | $ 4,975 | $ 6,042
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 35.00% |  |  |  |  |  |  |  |  | 21.00% | 34.00% | 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 |  |  |  |  |  |  |  |  |  |  | $ 80 | $ 72 | $ 130
Nondeductible expenses, percent |  |  |  |  |  |  |  |  |  |  | 0.20% | 0.50% | 0.70%
State income taxes/other—net of federal benefit, amount |  |  |  |  |  |  |  |  |  |  | $ 685 | $ (60) | $ 499
State income taxes/other—net of federal benefit, percent |  |  |  |  |  |  |  |  |  |  | 2.20% | (0.50%) | 2.80%
Total income tax (benefit) expense |  |  | $ (1,883) | $ (3,129) | $ (2,005) | $ (330) | $ 28,895 | $ (2,169) | $ (1,004) | $ (1,454) | $ 7,347 | $ (24,268) | $ 6,671
Total income tax (benefit) expense, percent |  |  |  |  |  |  |  |  |  |  | 23.40% | (165.90%) | 37.50%
[1] | On December 22, 2017, the Tax Cuts and Jobs Act (the Act) 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 (AMT) 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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