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Note 12 - Income Taxes - Comparison of Federal Statutory Income Tax Rates to Effective Income Tax Rates (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statutory federal tax, amount $ 12,652 $ 19,182 $ 16,997
Statutory federal tax, rate 21.00% 21.00% 21.00%
State tax, net of federal benefit $ 5,181 $ 8,278 $ 7,182
State tax, net of federal benefit, rate 8.60% 9.10% 8.90%
Tax-exempt income, amount $ (399) $ (355) $ (285)
Tax-exempt income, rate (0.70%) (0.40%) (0.40%)
Stock-based compensation, amount $ 54 $ (396) $ (404)
Stock-based compensation, rate 0.10% (0.40%) 0.50%
Stock-based compensation, rate (0.10%) 0.40% (0.50%)
Other items, net, amount $ 293 $ 309 $ 541
Other items, net, rate 0.50% 0.30% 0.70%
Total income tax expense $ 17,781 $ 27,018 $ 24,031
Total income tax expense 29.50% 29.60% 29.70%