Note 3 - Loans and Allowance for Loan Losses - Recorded Investment in Nonperforming Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Loans	$ 547,449	$ 514,766
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Loans	137,762	130,603
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]
Loans	19,489	19,478
Commercial Portfolio Segment [Member]
Loans	58,031	51,787
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Loans	55,893	54,453
Nonperforming Financial Instruments [Member]
Nonaccrual Loans	1,099	1,327
Loans 90+ Days Past Due Still Accruing	99	3
Loans	1,198	1,330
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Nonaccrual Loans	598	806
Loans 90+ Days Past Due Still Accruing	99	0
Loans	697	806
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]
Nonaccrual Loans	102	102
Loans 90+ Days Past Due Still Accruing	0	0
Loans	102	102
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]
Nonaccrual Loans	0	0
Loans 90+ Days Past Due Still Accruing	0	0
Loans	0	0
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Nonaccrual Loans	112	115
Loans 90+ Days Past Due Still Accruing	0	0
Loans	112	115
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Nonaccrual Loans	0	0
Loans 90+ Days Past Due Still Accruing	0	0
Loans	0	0
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Nonaccrual Loans	287	304
Loans 90+ Days Past Due Still Accruing	0	0
Loans	287	304
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]
Nonaccrual Loans	0	0
Loans 90+ Days Past Due Still Accruing	0	3
Loans	$ 0	$ 3