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Note 8 - Income Taxes - Reconciliation of Effective Tax Rate (Details)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Tax at federal statutory rate 21.00% 21.00% 21.00%
State income taxes, net of federal benefit 2.30% (3.70%) 1.50%
Compensation-based credits (0.30%) (0.30%) (0.30%)
Nondeductible expenses 0.20% 0.20% 0.20%
Tax exempt interest 0.00% 0.00% 0.00%
Company provided benefits 0.10% 0.40% 0.40%
Other, net (0.20%) 0.00% 0.10%
Effective tax rate 23.10% 17.60% 22.90%