Note 12 - Income Taxes - Reconciliation of Effective Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Federal income taxes at the statutory rate	$ 2,933	$ 1,238
Federal income taxes at the statutory rate, percent	21.00%	21.00%
State income taxes	$ 943	$ 398
State income taxes, percent	6.75%	6.75%
Tax-exempt interest income	$ (264)	$ (365)
Tax-exempt interest income, percent	(1.89%)	(6.19%)
Income from bank-owned life insurance	$ (151)	$ (128)
Income from bank-owned life insurance, percent	(1.08%)	(2.17%)
New Market Tax Credits	$ (456)	$ (456)
New Market Tax Credits, percent	(3.26%)	(7.73%)
Other, net	$ 91	$ 227
Other, net, percent	0.64%	3.84%
Total income tax provision	$ 3,096	$ 914
Actual tax expense and effective tax rate, percent	22.16%	15.50%