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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
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Statutory federal tax, amount | $ 7,493 | $ 12,652 | $ 19,182
Statutory federal tax, rate | 21.00% | 21.00% | 21.00%
State tax, net of federal benefit | $ 3,391 | $ 5,181 | $ 8,278
State tax, net of federal benefit, rate | 9.50% | 8.60% | 9.10%
Tax-exempt income, amount | $ (429) | $ (399) | $ (355)
Tax-exempt income, rate | (1.20%) | (0.70%) | (0.40%)
Stock-based compensation, amount | $ (10) | $ 54 | $ (396)
Stock-based compensation, rate | 0.00% | 0.10% | 0.40%
Stock-based compensation, rate | (0.00%) | (0.10%) | (0.40%)
Tax credits, net of amortization, amount | $ (978) | $ (62) | $ (80)
Tax credits, net of amortization, rate | (2.70%) | (0.10%) | (0.10%)
Other items, net, amount | $ (453) | $ 355 | $ 389
Other items, net, rate | (1.30%) | 0.60% | 0.40%
Total income tax expense | $ 9,014 | $ 17,781 | $ 27,018
Total income tax expense, rate | 25.30% | 29.50% | 29.60%

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