Note 12 - Income Taxes - Reconciliation for Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Provision at statutory tax rate, amount	$ 1,718	$ 2,019
Provision at statutory tax rate, percent	21.00%	21.00%
Tax free interest, net of disallowance, amount	$ (219)	$ (210)
Tax free interest, net of disallowance, percent	(2.70%)	(2.20%)
Earnings on bank-owned life insurance, amount	$ (84)	$ (85)
Earnings on bank-owned life insurance, percent	(1.00%)	(0.90%)
Other, net, amount	$ 20	$ (62)
Other, net, percent	0.20%	(0.60%)
Total	$ 1,435	$ 1,662
Provision, percent	17.50%	17.30%