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Note 4 - Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Beginning balance				$ 6,083				$ 6,625				$ 5,061	$ 6,083	$ 6,625	$ 5,061
Provision for Loan and Lease Losses	$ 400	$ 175	$ 200	175	$ (400)	$ 0	$ 0	75	$ 225	$ 400	$ 825	351	950	(325)	1,801
Charge-offs													(505)	(454)	(511)
Recoveries													244	237	274
Ending balance	6,772				6,083				6,625				6,772	6,083	6,625
Individually evaluated for impairment	155				7								155	7
Collectively evaluated for impairment	6,617				6,045								6,617	6,045
Financing Receivable, Allowance for Credit Loss, Ending Balance	6,772				6,083				6,625				6,772	6,083	6,625
Ending balance	6,772				6,083				6,625				6,772	6,083	6,625
Individually evaluated for impairment	1,935				2,315								1,935	2,315
Collectively evaluated for impairment	564,327				488,234								564,327	488,234
Recorded investment in loans	566,548				490,830								566,548	490,830
Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance				31									31
Ending balance	0				31								0	31
Financing Receivable, Allowance for Credit Loss, Ending Balance	0				31								0	31
Ending balance	0				31								0	31
Recorded investment in loans	286				281								286	281
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Beginning balance				1,174				1,239				867	1,174	1,239	867
Provision for Loan and Lease Losses													247	(35)	393
Charge-offs													(48)	(35)	(72)
Recoveries													10	5	51
Ending balance	1,383				1,174				1,239				1,383	1,174	1,239
Individually evaluated for impairment	0				0								0	0
Collectively evaluated for impairment	1,383				1,143								1,383	1,143
Financing Receivable, Allowance for Credit Loss, Ending Balance	1,383				1,174				1,239				1,383	1,174	1,239
Ending balance	1,383				1,174				1,239				1,383	1,174	1,239
Individually evaluated for impairment	854				1,034								854	1,034
Collectively evaluated for impairment	154,798				129,848								154,798	129,848
Recorded investment in loans	155,938				131,152								155,938	131,152
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance				31									31
Ending balance	0				31								0	31
Financing Receivable, Allowance for Credit Loss, Ending Balance	0				31								0	31
Ending balance	0				31								0	31
Recorded investment in loans	286				270								286	270
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Beginning balance				234				209				163	234	209	163
Provision for Loan and Lease Losses													31	34	46
Charge-offs													0	(9)	0
Recoveries													0	0	0
Ending balance	265				234				209				265	234	209
Individually evaluated for impairment	0				0								0	0
Collectively evaluated for impairment	265				234								265	234
Financing Receivable, Allowance for Credit Loss, Ending Balance	265				234				209				265	234	209
Ending balance	265				234				209				265	234	209
Individually evaluated for impairment	51				102								51	102
Collectively evaluated for impairment	21,946				19,492								21,946	19,492
Recorded investment in loans	21,997				19,594								21,997	19,594
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance				0									0
Ending balance	0				0								0	0
Financing Receivable, Allowance for Credit Loss, Ending Balance	0				0								0	0
Ending balance	0				0								0	0
Recorded investment in loans	0				0								0	0
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Beginning balance				403				292				350	403	292	350
Provision for Loan and Lease Losses													123	111	(58)
Charge-offs													0	0	0
Recoveries													0	0	0
Ending balance	526				403				292				526	403	292
Individually evaluated for impairment	0				0								0	0
Collectively evaluated for impairment	526				403								526	403
Financing Receivable, Allowance for Credit Loss, Ending Balance	526				403				292				526	403	292
Ending balance	526				403				292				526	403	292
Individually evaluated for impairment	0				0								0	0
Collectively evaluated for impairment	42,364				33,491								42,364	33,491
Recorded investment in loans	42,364				33,491								42,364	33,491
Real Estate Mortgage Portfolio Segment [Member] \| Construction Loans [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance				0									0
Ending balance	0				0								0	0
Financing Receivable, Allowance for Credit Loss, Ending Balance	0				0								0	0
Ending balance	0				0								0	0
Recorded investment in loans	0				0								0	0
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Beginning balance				1,884				2,358				1,623	1,884	2,358	1,623
Provision for Loan and Lease Losses													147	(474)	735
Charge-offs													0	0	0
Recoveries													0	0	0
Ending balance	2,031				1,884				2,358				2,031	1,884	2,358
Individually evaluated for impairment	0				0								0	0
Collectively evaluated for impairment	2,031				1,884								2,031	1,884
Financing Receivable, Allowance for Credit Loss, Ending Balance	2,031				1,884				2,358				2,031	1,884	2,358
Ending balance	2,031				1,884				2,358				2,031	1,884	2,358
Individually evaluated for impairment	463				702								463	702
Collectively evaluated for impairment	161,212				137,428								161,212	137,428
Recorded investment in loans	161,675				138,141								161,675	138,141
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance				0									0
Ending balance	0				0								0	0
Financing Receivable, Allowance for Credit Loss, Ending Balance	0				0								0	0
Ending balance	0				0								0	0
Recorded investment in loans	0				11								0	11
Commercial Portfolio Segment [Member]
Beginning balance				873				843				595	873	843	595
Provision for Loan and Lease Losses													173	20	280
Charge-offs													(9)	0	(32)
Recoveries													9	10	0
Ending balance	1,046				873				843				1,046	873	843
Individually evaluated for impairment	155				0								155	0
Collectively evaluated for impairment	891				873								891	873
Financing Receivable, Allowance for Credit Loss, Ending Balance	1,046				873				843				1,046	873	843
Ending balance	1,046				873				843				1,046	873	843
Individually evaluated for impairment	195				174								195	174
Collectively evaluated for impairment	60,781				51,747								60,781	51,747
Recorded investment in loans	60,976				51,921								60,976	51,921
Commercial Portfolio Segment [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance				0									0
Ending balance	0				0								0	0
Financing Receivable, Allowance for Credit Loss, Ending Balance	0				0								0	0
Ending balance	0				0								0	0
Recorded investment in loans	0				0								0	0
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member]
Beginning balance				527				617				515	527	617	515
Provision for Loan and Lease Losses													1	(88)	91
Charge-offs													0	(10)	0
Recoveries													2	8	11
Ending balance	530				527				617				530	527	617
Individually evaluated for impairment	0				7								0	7
Collectively evaluated for impairment	530				520								530	520
Financing Receivable, Allowance for Credit Loss, Ending Balance	530				527				617				530	527	617
Ending balance	530				527				617				530	527	617
Individually evaluated for impairment	372				303								372	303
Collectively evaluated for impairment	58,961				55,439								58,961	55,439
Recorded investment in loans	59,333				55,742								59,333	55,742
Consumer Portfolio Segment [Member] \| Home Equity and Second Mortgage [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance				0									0
Ending balance	0				0								0	0
Financing Receivable, Allowance for Credit Loss, Ending Balance	0				0								0	0
Ending balance	0				0								0	0
Recorded investment in loans	0				0								0	0
Consumer Portfolio Segment [Member] \| All Other Consumer Excluding Home Equity and Second Mortgage [Member]
Beginning balance				988				1,067					988	1,067
Provision for Loan and Lease Losses													228	107
Charge-offs													(448)	(400)
Recoveries													223	214
Ending balance	991				988				1,067				991	988	1,067
Individually evaluated for impairment	0				0								0	0
Collectively evaluated for impairment	991				988								991	988
Financing Receivable, Allowance for Credit Loss, Ending Balance	991				988				1,067				991	988	1,067
Ending balance	991				988				1,067				991	988	1,067
Individually evaluated for impairment	0				0								0	0
Collectively evaluated for impairment	64,265				60,789								64,265	60,789
Recorded investment in loans	64,265				60,789								64,265	60,789
Consumer Portfolio Segment [Member] \| All Other Consumer Excluding Home Equity and Second Mortgage [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance				$ 0									0
Ending balance	0				0								0	0
Financing Receivable, Allowance for Credit Loss, Ending Balance	0				0								0	0
Ending balance	0				0								0	0
Recorded investment in loans	0				0								0	0
Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member]
Beginning balance								$ 1,067				$ 948		1,067	948
Provision for Loan and Lease Losses															314
Charge-offs															(407)
Recoveries															212
Ending balance									1,067						1,067
Financing Receivable, Allowance for Credit Loss, Ending Balance									1,067						1,067
Ending balance									$ 1,067						$ 1,067
Recorded investment in loans	$ 64,265				$ 60,789								$ 64,265	$ 60,789