Note 3 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands		Mar. 31, 2022		Dec. 31, 2021		Mar. 31, 2021	Dec. 31, 2020
Gross loans		$ 819,774					$ 803,729
Loans 90 or more days past due and accruing		381		$ 90
Nonaccruals		2,862	[1]	2,873	[1]	$ 3,691
Financing Receivables 30 to 89 Days Past Due [Member]
Gross loans		901		987
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Gross loans		672		356
Real Estate Construction Portfolio Segment[Member]
Gross loans		59,741		48,841			48,841
Loans 90 or more days past due and accruing		320		0
Nonaccruals	[1]	0		0
Real Estate Construction Portfolio Segment[Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Gross loans		0		14
Real Estate Construction Portfolio Segment[Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Gross loans		320		0
Consumer Real Estate Portfolio Segment [Member]
Gross loans		209,072		208,977			208,977
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]
Loans 90 or more days past due and accruing		0		29
Nonaccruals	[1]	29
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]
Loans 90 or more days past due and accruing		32		58
Nonaccruals	[1]	0		0
Consumer Real Estate Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Equity Lines [Member]
Gross loans		50		50
Consumer Real Estate Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Closed End First Liens [Member]
Gross loans		517		715
Consumer Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Equity Lines [Member]
Gross loans		29		29
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		32		58
Commercial Real Estate Portfolio Segment [Member]
Gross loans		416,953		405,722			405,722
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]
Loans 90 or more days past due and accruing		0		0
Nonaccruals	[1]	2,546		2,572
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate, Owner Occupied [Member]
Gross loans		61		12
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		262		266
Commercial Non Real Estate Segment [Member]
Gross loans		52,796		60,264			60,264
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]
Loans 90 or more days past due and accruing		2		0
Nonaccruals	[1]	287		301
Commercial Non Real Estate Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Commercial and Industrial [Member]
Gross loans		53		13
Commercial Non Real Estate Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and Industrial [Member]
Gross loans		2		0
Consumer Non Real Estate Portfolio Segment [Member]
Gross loans		34,056		32,026			$ 32,026
Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]
Loans 90 or more days past due and accruing		2		2
Nonaccruals	[1]	0		0
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]
Loans 90 or more days past due and accruing		0		0
Nonaccruals	[1]	0		0
Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]
Loans 90 or more days past due and accruing		25		1
Nonaccruals	[1]	0		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
Consumer Non Real Estate Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Automobile Loan [Member]
Gross loans		80		93
Consumer Non Real Estate Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Other Consumer Loans [Member]
Gross loans		139		88
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		2		2
Consumer Non Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Automobile Loan [Member]
Gross loans		0		0
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		$ 25		$ 1

[1] Includes current and past due loans in nonaccrual status. Includes impaired loans in nonaccrual status.