Note 3 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands		Sep. 30, 2021		Dec. 31, 2020		Sep. 30, 2020
Gross loans		$ 798,606		$ 770,027
Loans past due 90 days or more and still accruing		62		17		$ 236
Nonaccruals		3,114	[1]	3,685	[2]	$ 3,602
Financing Receivables 30 to 89 Days Past Due [Member]
Gross loans		1,223		1,497
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Gross loans		815		1,331
Real Estate Construction Portfolio Segment[Member]
Gross loans		50,883		42,266
Loans past due 90 days or more and still accruing	[3]	0
Nonaccruals	[1],[3]	0
Real Estate Construction Portfolio Segment[Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Gross loans	[3]	115
Real Estate Construction Portfolio Segment[Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Gross loans	[3]	0
Consumer Real Estate Portfolio Segment [Member]
Gross loans		204,880		181,782
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]
Loans past due 90 days or more and still accruing	[3]	39		0
Nonaccruals	[3]	0	[1]	62	[2]
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]
Loans past due 90 days or more and still accruing	[3]	0		0
Nonaccruals	[3]	0	[1]	0	[2]
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]
Loans past due 90 days or more and still accruing	[3]	0
Nonaccruals	[1],[3]	0
Consumer Real Estate Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Closed End First Liens [Member]
Gross loans	[3]	489		365
Consumer Real Estate Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Investor Owned Residential Real Estate [Member]
Gross loans	[3]	102		106
Consumer Real Estate Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Equity Lines [Member]
Gross loans	[3]	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	[3]	39		62
Consumer Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Investor Owned Residential Real Estate [Member]
Gross loans	[3]	0		0
Consumer Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Equity Lines [Member]
Gross loans	[3]	0
Commercial Real Estate Portfolio Segment [Member]
Gross loans		403,840		393,115
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]
Loans past due 90 days or more and still accruing	[3]	0		0
Nonaccruals	[3]	2,767	[1]	2,941	[2]
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Loans past due 90 days or more and still accruing	[3]	0		0
Nonaccruals	[3]	0	[1]	654	[2]
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate, Owner Occupied [Member]
Gross loans	[3]	147		15
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Other [Member]
Gross loans	[3]	0		0
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	[3]	445		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	[3]	0		654
Commercial Non Real Estate Segment [Member]
Gross loans		59,082		78,771
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]
Loans past due 90 days or more and still accruing	[3]	10		0
Nonaccruals	[3]	347	[1]	28	[2]
Commercial Non Real Estate Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Commercial and Industrial [Member]
Gross loans	[3]	29		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	[3]	318		27
Consumer Non Real Estate Portfolio Segment [Member]
Gross loans		31,576		33,110
Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]
Loans past due 90 days or more and still accruing	[3]	1		3
Nonaccruals	[3]	0	[1]	0	[2]
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]
Loans past due 90 days or more and still accruing	[3]	0		1
Nonaccruals	[3]	0	[1]	0	[2]
Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]
Loans past due 90 days or more and still accruing	[3]	12		13
Nonaccruals	[3]	0	[1]	0	[2]
Consumer Non Real Estate Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Credit Card Receivable [Member]
Gross loans	[3]	3		7
Consumer Non Real Estate Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Automobile Loan [Member]
Gross loans	[3]	91		144
Consumer Non Real Estate Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member] | Other Consumer Loans [Member]
Gross loans	[3]	218		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	[3]	1		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	[3]	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	[3]	$ 12		$ 13

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

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

[3] Only classes with past-due or nonaccrual loans are shown.