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Note 11 - Income Taxes - Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current federal income tax expense	$ 3,070	$ 984	$ 946
Deferred federal income tax expense/(benefit)	202	310	209
Income tax expense	3,272	1,294	1,155
Income tax computed at statutory federal rate of 21%	3,966	1,778	1,783
Tax exempt interest income	(574)	(320)	(309)
Tax exempt earnings on bank-owned life insurance	(162)	(162)	(81)
Tax credits	(240)	(218)	(154)
Nondeductible merger expenses	182	164	0
Other items	$ 100	$ 52	$ (84)
Effective income tax rate	17.00%	15.00%	14.00%

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