Note 9 - Income Taxes - Reconciliation of Expected Income Tax Expense With Reported Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Computed "expected" income tax expense	$ 6,670	$ 5,173
Tax-exempt interest income	(728)	(763)
Nondeductible interest expense	24	25
Other, net	(135)	(184)
Total income tax expense	$ 5,831	$ 4,251