Note 4 - Loans, Allowance for Credit Losses and Other Real Estate Owned - Loans by Delinquency and Nonaccrual Status (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Total loans	$ 885,850	$ 958,488
Nonaccrual	209	146
Financial Asset, Not Past Due [Member]
Total loans	877,895	949,456
Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	5,457	6,158
Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	1,260	2,100
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	1,029	628
Commercial Portfolio Segment [Member]
Total loans	135,575	169,617
Nonaccrual	0	50
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Total loans	135,477	169,337
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	0	172
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	25	58
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	73	0
Commercial Real Estate Portfolio Segment [Member]
Total loans	494,282	491,107
Nonaccrual	192	53
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Total loans	493,537	490,354
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	443	508
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	110	192
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	0	0
Construction Portfolio Segment [Member]
Total loans	5,043	3,088
Nonaccrual	0	0
Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Total loans	5,043	3,088
Construction Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	0	0
Construction Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	0	0
Construction Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	0	0
Residential Portfolio Segment [Member]
Total loans	11,283	13,834
Nonaccrual	3	27
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Total loans	11,280	13,430
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	0	377
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	0	0
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	0	0
Consumer Portfolio Segment [Member]
Total loans	239,667	280,842
Nonaccrual	14	16
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Total loans	232,558	273,247
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	5,014	5,101
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	1,125	1,850
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	$ 956	$ 628