Note 5 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Gross loans		$ 803,729	$ 770,027
Loans past due 90 days or more and still accruing		90	17
Nonaccruals		2,873	3,685
Financing Receivables 30 to 89 Days Past Due [Member]
Gross loans		987	1,497
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Gross loans		356	1,331
Real Estate Construction Portfolio Segment[Member]
Gross loans		48,841	42,266
Loans past due 90 days or more and still accruing	[1]	0
Nonaccruals	[1]	0
Real Estate Construction Portfolio Segment[Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Gross loans	[1]	14
Real Estate Construction Portfolio Segment[Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Gross loans	[1]	0
Consumer Real Estate Portfolio Segment [Member]
Gross loans		208,977	181,782
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]
Loans past due 90 days or more and still accruing	[1]	58
Nonaccruals	[1]	0	62
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]
Loans past due 90 days or more and still accruing	[1]	29
Nonaccruals	[1]
Consumer Real Estate Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Closed End First Liens [Member]
Gross loans	[1]	715	365
Consumer Real Estate Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Equity Lines [Member]
Gross loans	[1]	50
Consumer Real Estate Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Investor Owned Residential Real Estate [Member]
Gross loans	[1]		106
Consumer Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Closed End First Liens [Member]
Gross loans	[1]	58	62
Consumer Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Equity Lines [Member]
Gross loans	[1]	29
Commercial Real Estate Portfolio Segment [Member]
Gross loans		405,722	393,115
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]
Nonaccruals	[1]	2,572	2,941
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Nonaccruals	[1]		654
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate, Owner Occupied [Member]
Gross loans	[1]	12	15
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate, Owner Occupied [Member]
Gross loans	[1]	266	571
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Other [Member]
Gross loans	[1]		654
Commercial Non Real Estate Segment [Member]
Gross loans		60,264	78,771
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]
Nonaccruals	[1]	301	28
Commercial Non Real Estate Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Commercial and Industrial [Member]
Gross loans	[1]	13	730
Commercial Non Real Estate Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and Industrial [Member]
Gross loans	[1]	0	27
Consumer Non Real Estate Portfolio Segment [Member]
Gross loans		32,026	33,110
Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]
Loans past due 90 days or more and still accruing	[1]	2	3
Nonaccruals			0
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]
Loans past due 90 days or more and still accruing	[1]	0	1
Nonaccruals			0
Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]
Loans past due 90 days or more and still accruing	[1]	1	13
Nonaccruals			0
Consumer Non Real Estate Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Credit Card Receivable [Member]
Gross loans	[1]	2	7
Consumer Non Real Estate Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Automobile Loan [Member]
Gross loans	[1]	93	144
Consumer Non Real Estate Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Other Consumer Loans [Member]
Gross loans	[1]	88	130
Consumer Non Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Credit Card Receivable [Member]
Gross loans	[1]	2	3
Consumer Non Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Automobile Loan [Member]
Gross loans	[1]	0	1
Consumer Non Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Other Consumer Loans [Member]
Gross loans	[1]	$ 1	$ 13

[1] Only classes with past due or nonaccrual loans are presented.