Note 3 - Loans and Allowance for Credit Losses - Loans by Delinquency and Nonaccrual Status (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Total loans	$ 866,602	$ 958,488
Nonaccrual	403	146
Financial Asset, Not Past Due [Member]
Total loans	857,250	949,456
Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	6,553	6,158
Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	2,008	2,100
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	388	628
Commercial Portfolio Segment [Member]
Total loans	136,550	169,617
Nonaccrual	71	50
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Total loans	136,421	169,337
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	58	172
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	0	58
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	0	0
Commercial Real Estate Portfolio Segment [Member]
Total loans	487,523	491,107
Nonaccrual	330	53
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Total loans	485,476	490,354
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	951	508
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	766	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	5,063	3,088
Nonaccrual	0	0
Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Total loans	5,063	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	9,935	13,834
Nonaccrual	2	27
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Total loans	9,933	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	227,531	280,842
Nonaccrual	0	16
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Total loans	220,357	273,247
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	5,544	5,101
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	1,242	1,850
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	$ 388	$ 628