Note 12 - Income Taxes - Reconciliation for Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Provision at statutory tax rate, amount	$ 2,019	$ 1,017
Provision at statutory tax rate, percent	21.00%	21.00%
Tax free interest, net of disallowance, amount	$ (210)	$ (234)
Tax free interest, net of disallowance, percent	(2.20%)	(4.80%)
Earnings on bank-owned life insurance, amount	$ (85)	$ (71)
Earnings on bank-owned life insurance, percent	(0.90%)	(1.50%)
Tax free gain on retirement of CMFP shares, amount		$ (145)
Tax free gain on retirement of CMFP shares, percent		(3.00%)
Other, net, amount	$ (62)	$ 66
Other, net, percent	(0.60%)	1.40%
Provision for income taxes	$ 1,662	$ 633
Provision, percent	17.30%	13.10%