Note 4 - Loans and Allowance for Loan Losses - Aging of Recorded Investment in Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Loans	$ 490,830	$ 508,879
Financial Asset Acquired with Credit Deterioration [Member]
Loans	281	297
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Loans	131,152	131,850
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Loans	270	271
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]
Loans	19,594	17,461
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Loans	0	0
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]
Loans	33,491	25,018
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Loans	0	0
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Loans	138,141	135,484
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Loans	11	26
Commercial Portfolio Segment [Member]
Loans	51,921	81,809
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Loans	0	0
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Loans	55,742	53,277
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Loans	0	0
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]
Loans	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]
Loans	0	0
Financial Asset, 30 to 59 Days Past Due [Member]
Loans	1,574	2,295
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Loans	1,186	1,672
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]
Loans	94	130
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]
Loans	0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Loans	0	155
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans	0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Loans	165	53
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]
Loans	129	285
Financial Asset, 60 to 89 Days Past Due [Member]
Loans	223	695
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Loans	158	227
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]
Loans	62	65
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]
Loans	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Loans	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Loans	0	302
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]
Loans	3	101
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	606	882
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Loans	501	726
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]
Loans	102	156
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]
Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Loans	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]
Loans	3	0
Financial Asset, Past Due [Member]
Loans	2,403	3,872
Financial Asset, Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Loans	1,845	2,625
Financial Asset, Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]
Loans	258	351
Financial Asset, Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]
Loans	0	0
Financial Asset, Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Loans	0	155
Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member]
Loans	0	0
Financial Asset, Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Loans	165	355
Financial Asset, Past Due [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]
Loans	135	386
Financial Asset, Not Past Due [Member]
Loans	488,146	504,710
Financial Asset, Not Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Loans	129,037	128,954
Financial Asset, Not Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]
Loans	19,336	17,110
Financial Asset, Not Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]
Loans	33,491	25,018
Financial Asset, Not Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Loans	138,130	135,303
Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member]
Loans	51,921	81,809
Financial Asset, Not Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Loans	55,577	52,922
Financial Asset, Not Past Due [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]
Loans	$ 60,654	$ 63,594