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Note 7 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Federal statutory tax rate 21.00% 21.00% 21.00%
State statutory rates, net of federal benefits 3.60% 3.70% 3.70%
Deferred tax adjustments (1.00%) (0.60%) (0.10%)
Dividends received deduction (0.50%) (0.50%) (0.50%)
Excess tax benefits from equity compensation plans (0.20%) (0.30%) (0.80%)
Other tax adjustments 0.00% (0.20%) 0.10%
Effective tax rate 22.90% 23.10% 23.40%