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Note 10 - Federal Income Taxes - Consolidated Income Tax Expense (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Current expense | $ 14,945,000 | $ 10,978,000 | $ 10,170,000
Deferred expense | (4,141,000) | 26,000 | (372,000)
Change in valuation allowance | (94,000) | 0 | 0
Tax expense | $ 10,710,000 | $ 11,004,000 | $ 9,798,000

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