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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
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Federal income tax at statutory rate, amount |  |  |  |  |  |  |  |  | $ 4,916 | $ 2,124 | $ 6,582
Federal income tax at statutory rate, percent |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 21.00%
Nondeductible per diem and meals, amount |  |  |  |  |  |  |  |  | $ 321 | $ 0 | $ 0
Nondeductible per diem and meals, percent |  |  |  |  |  |  |  |  | 1.40% | 0.00% | 0.00%
Other nondeductible expenses, net, amount |  |  |  |  |  |  |  |  | $ 0 | $ 342 | $ 80
Other nondeductible expenses, net, percent |  |  |  |  |  |  |  |  | 0.00% | 3.40% | 0.20%
State income taxes/other, net, amount |  |  |  |  |  |  |  |  | $ 345 | $ (251) | $ 685
State income taxes/other, net, percent |  |  |  |  |  |  |  |  | 1.50% | (2.50%) | 2.20%
Total federal & state income tax expense | $ 4,713 | $ 1,769 | $ (402) | $ (498) | $ (4,168) | $ 1,264 | $ 2,301 | $ 2,818 | $ 5,582 | $ 2,215 | $ 7,347
Total income tax (benefit) expense, percent |  |  |  |  |  |  |  |  | 23.90% | 21.90% | 23.40%

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