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Note 10 - Federal Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Tax at statutory rate	$ 15,915,000	$ 15,481,000	$ 11,518,000
Tax-exempt interest	(695,000)	(658,000)	(681,000)
Bank owned life insurance	(334,000)	(233,000)	(238,000)
Change in valuation allowance	0	0	(94,000)
Other	(159,000)	105,000	205,000
Tax expense	$ 14,727,000	$ 14,695,000	$ 10,710,000

X

- Definition

Amount of the difference between reported income tax expense (benefit) and expected tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from bank owned life insurance that is exempt from income taxes.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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