Note 3 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands		Jun. 30, 2022		Dec. 31, 2021		Jun. 30, 2021	Dec. 31, 2020
Gross loans		$ 849,274					$ 803,729
Loans past due 90 days or more and still accruing		7		$ 90		$ 28
Nonaccruals		2,979	[1]	2,873	[1]	$ 3,822
Consumer Real Estate Portfolio Segment [Member]
Gross loans		217,143		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		0		58
Nonaccruals	[1]	137		0
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]
Loans past due 90 days or more and still accruing		0		29
Nonaccruals	[1]	29		0
Real Estate Construction Portfolio Segment[Member]
Gross loans		69,724		48,841			48,841
Loans past due 90 days or more and still accruing				0
Nonaccruals	[1]			0
Commercial Real Estate Portfolio Segment [Member]
Gross loans		425,388		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	[1]	2,532		2,572
Commercial Non Real Estate Segment [Member]
Gross loans		52,338		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	[1]	279		301
Consumer Non Real Estate Portfolio Segment [Member]
Gross loans		34,825		32,026			$ 32,026
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]
Loans past due 90 days or more and still accruing		0		0
Nonaccruals	[1]	0		0
Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]
Loans past due 90 days or more and still accruing				2
Nonaccruals	[1]			0
Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]
Loans past due 90 days or more and still accruing		7		1
Nonaccruals	[1]	2		0
Financing Receivables 30 to 89 Days Past Due [Member]
Gross loans		870		987
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]
Gross loans		641		715
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]
Gross loans		0		50
Financing Receivables 30 to 89 Days Past Due [Member] | Real Estate Construction Portfolio Segment[Member]
Gross loans				14
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]
Gross loans		19		12
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]
Gross loans		37		13
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]
Gross loans		35		93
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] | Other Consumer Loans [Member]
Gross loans		136		88
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Gross loans		431		356
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		137		58
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]
Gross loans		29		29
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Construction Portfolio Segment[Member]
Gross loans				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		258		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		0		0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]
Gross loans		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				2
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		$ 7		$ 1

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