Note 8 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Provision at statutory tax rates	$ 879	$ 706
Provision at statutory tax rates, percentage	21.00%	21.00%
Tax effects of tax-free interest income	$ (263)	$ (212)
Tax effects of tax free interest income, percentage	(6.30%)	(6.31%)
Non-deductible interest expense	$ 113	$ 21
Non-deductible interest expense, percentage	2.70%	0.63%
Bank-owned life insurance	$ (90)	$ (41)
Bank-owned life insurance, percentage	(2.16%)	(1.22%)
Unrealized losses on equity securities	$ 87	$ 107
Unrealized losses on equity securities, percentage	2.07%	3.18%
Other items, net	$ (74)	$ 116
Other items, net, percentage	(1.73%)	3.45%
Income tax provision	$ 652	$ 697
Income tax provision, percentage	15.58%	20.74%