Note 3 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands		Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Gross loans		$ 853,272			$ 803,729
Loans past due 90 days or more and still accruing		48	$ 90	$ 62
Nonaccruals		2,888	2,873	$ 3,114
Real Estate Construction Portfolio Segment[Member]
Gross loans		62,821	48,841		48,841
Loans past due 90 days or more and still accruing		0	0
Nonaccruals		0	0
Consumer Real Estate Portfolio Segment [Member]
Gross loans		219,617	208,977		208,977
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]
Loans past due 90 days or more and still accruing		42	58
Nonaccruals		118	0
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]
Loans past due 90 days or more and still accruing		0	29
Nonaccruals		0	0
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]
Loans past due 90 days or more and still accruing		0
Nonaccruals		0
Commercial Real Estate Portfolio Segment [Member]
Gross loans		435,185	405,722		405,722
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]
Loans past due 90 days or more and still accruing		0	0
Nonaccruals		2,507	2,572
Commercial Non Real Estate Segment [Member]
Gross loans		52,409	60,264		60,264
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]
Loans past due 90 days or more and still accruing		0	0
Nonaccruals		263	301
Consumer Non Real Estate Portfolio Segment [Member]
Gross loans		34,328	32,026		$ 32,026
Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]
Loans past due 90 days or more and still accruing		1	2
Nonaccruals		0	0
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]
Loans past due 90 days or more and still accruing		0	0
Nonaccruals		0	0
Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]
Loans past due 90 days or more and still accruing		5	1
Nonaccruals		0	0
Financing Receivables 30 to 89 Days Past Due [Member]
Gross loans		1,436	987
Financing Receivables 30 to 89 Days Past Due [Member] | Real Estate Construction Portfolio Segment[Member]
Gross loans		311	14
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]
Gross loans		769	715
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]
Gross loans		7	50
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]
Gross loans		144
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]
Gross loans		0	12
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]
Gross loans		82	13
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]
Gross loans		2	2
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]
Gross loans		53	93
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]
Gross loans		68	88
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Gross loans	[1]	420	356
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Construction Portfolio Segment[Member]
Gross loans	[1]	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]
Gross loans	[1]	159	58
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]
Gross loans	[1]	0	29
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]
Gross loans	[1]	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]
Gross loans	[1]	255	266
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]
Gross loans	[1]	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]
Gross loans	[1]	1	2
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]
Gross loans	[1]	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]
Gross loans	[1]	$ 5	$ 1

[1] Includes accruing and nonaccrual loans past due 90 days or more.