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Note 10 - Federal Income Taxes - Consolidated Income Tax Expense (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Current expense $ 16,080,000 $ 12,675,000 $ 14,945,000
Deferred expense (1,353,000) 2,020,000 (4,141,000)
Change in valuation allowance 0 0 (94,000)
Tax expense $ 14,727,000 $ 14,695,000 $ 10,710,000