Note 9 - Income Taxes - Reconciliation of Expected Income Tax Expense With Reported Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Computed "expected" income tax expense	$ 5,173	$ 4,021
Tax-exempt interest income	(763)	(798)
Nondeductible interest expense	25	62
Other, net	(184)	(208)
Total income tax expense	$ 4,251	$ 3,077