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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, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Beginning balance				$ 6,625				$ 5,061				$ 4,065	$ 6,625	$ 5,061	$ 4,065
Provision for Loan and Lease Losses, Total	$ (400)	$ 0	$ 0	75	$ 225	$ 400	$ 825	351	$ 450	$ 225	$ 300	450	(325)	1,801	1,425
Charge-offs													(454)	(511)	(766)
Recoveries													237	274	337
Ending balance	6,083				6,625				5,061				6,083	6,625	5,061
Individually evaluated for impairment	7				0								7	0
Collectively evaluated for impairment	6,045				6,594								6,045	6,594
Ending balance	6,083				6,625				5,061				6,083	6,625	5,061
Individually evaluated for impairment	2,315				3,168								2,315	3,168
Collectively evaluated for impairment	488,234				505,414								488,234	505,414
Recorded investment in loans	490,830				508,879								490,830	508,879
Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance				31									31
Ending balance	31				31								31	31
Ending balance	31				31								31	31
Recorded investment in loans	281				297								281	297
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Beginning balance				1,239				867				693	1,239	867	693
Provision for Loan and Lease Losses, Total													(35)	393	251
Charge-offs													(35)	(72)	(194)
Recoveries													5	51	117
Ending balance	1,174				1,239				867				1,174	1,239	867
Individually evaluated for impairment	0				0								0	0
Collectively evaluated for impairment	1,143				1,208								1,143	1,208
Ending balance	1,174				1,239				867				1,174	1,239	867
Individually evaluated for impairment	1,034				1,728								1,034	1,728
Collectively evaluated for impairment	129,848				129,851								129,848	129,851
Recorded investment in loans	131,152				131,850								131,152	131,850
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance				31									31
Ending balance	31				31								31	31
Ending balance	31				31								31	31
Recorded investment in loans	270				271								270	271
Real Estate Mortgage Portfolio Segment [Member] \| Land Loan [Member]
Beginning balance				209				163				162	209	163	162
Provision for Loan and Lease Losses, Total													34	46	0
Charge-offs													(9)	0	0
Recoveries													0	0	1
Ending balance	234				209				163				234	209	163
Individually evaluated for impairment	0				0								0	0
Collectively evaluated for impairment	234				209								234	209
Ending balance	234				209				163				234	209	163
Individually evaluated for impairment	102				97								102	97
Collectively evaluated for impairment	19,492				17,364								19,492	17,364
Recorded investment in loans	19,594				17,461								19,594	17,461
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
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				292				350				224	292	350	224
Provision for Loan and Lease Losses, Total													111	(58)	126
Charge-offs													0	0	0
Recoveries													0	0	0
Ending balance	403				292				350				403	292	350
Individually evaluated for impairment	0				0								0	0
Collectively evaluated for impairment	403				292								403	292
Ending balance	403				292				350				403	292	350
Individually evaluated for impairment	0				0								0	0
Collectively evaluated for impairment	33,491				25,018								33,491	25,018
Recorded investment in loans	33,491				25,018								33,491	25,018
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
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				2,358				1,623				1,401	2,358	1,623	1,401
Provision for Loan and Lease Losses, Total													(474)	735	222
Charge-offs													0	0	0
Recoveries													0	0	0
Ending balance	1,884				2,358				1,623				1,884	2,358	1,623
Individually evaluated for impairment	0				0								0	0
Collectively evaluated for impairment	1,884				2,358								1,884	2,358
Ending balance	1,884				2,358				1,623				1,884	2,358	1,623
Individually evaluated for impairment	702				779								702	779
Collectively evaluated for impairment	137,428				134,679								137,428	134,679
Recorded investment in loans	138,141				135,484								138,141	135,484
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
Ending balance	0				0								0	0
Recorded investment in loans	11				26								11	26
Commercial Portfolio Segment [Member]
Beginning balance				843				595				459	843	595	459
Provision for Loan and Lease Losses, Total													20	280	132
Charge-offs													0	(32)	0
Recoveries													10	0	4
Ending balance	873				843				595				873	843	595
Individually evaluated for impairment	0				0								0	0
Collectively evaluated for impairment	873				843								873	843
Ending balance	873				843				595				873	843	595
Individually evaluated for impairment	174				211								174	211
Collectively evaluated for impairment	51,747				81,598								51,747	81,598
Recorded investment in loans	51,921				81,809								51,921	81,809
Commercial Portfolio Segment [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Beginning balance				0									0
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				617				515				443	617	515	443
Provision for Loan and Lease Losses, Total													(88)	91	77
Charge-offs													(10)	0	(24)
Recoveries													8	11	19
Ending balance	527				617				515				527	617	515
Individually evaluated for impairment	7				0								7	0
Collectively evaluated for impairment	520				617								520	617
Ending balance	527				617				515				527	617	515
Individually evaluated for impairment	303				353								303	353
Collectively evaluated for impairment	55,439				52,924								55,439	52,924
Recorded investment in loans	55,742				53,277								55,742	53,277
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
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				1,067				948					1,067	948
Provision for Loan and Lease Losses, Total													107	314
Charge-offs													(400)	(407)
Recoveries													214	212
Ending balance	988				1,067				948				988	1,067	948
Individually evaluated for impairment	0				0								0	0
Collectively evaluated for impairment	988				1,067								988	1,067
Ending balance	988				1,067				948				988	1,067	948
Individually evaluated for impairment	0				0								0	0
Collectively evaluated for impairment	60,789				63,980								60,789	63,980
Recorded investment in loans	60,789				63,980								60,789	63,980
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
Ending balance	0				0								0	0
Recorded investment in loans	0				0								0	0
Consumer Portfolio Segment [Member] \| Other Consumer Loan [Member]
Beginning balance								$ 948				$ 683		948	683
Provision for Loan and Lease Losses, Total															617
Charge-offs															(548)
Recoveries															196
Ending balance									948						948
Ending balance									$ 948						$ 948
Recorded investment in loans	$ 60,789				$ 63,980								$ 60,789	$ 63,980