Note 4 - Loans and Allowance for Credit Losses - Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Loans	$ 627,764	$ 587,962
Loans, 90 days past due and still accruing	1,262	0
Financial Asset, 30 to 59 Days Past Due [Member]
Loans	202	0
Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0	270
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	1,262	404
Financial Asset, Past Due [Member]
Loans	1,464	674
Financial Asset, Not Past Due [Member]
Loans	626,300	587,288
Commercial Real Estate Portfolio Segment [Member]
Loans	430,518	398,126
Loans, 90 days past due and still accruing	1,262	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	1,262	404
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans	1,262	404
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans	429,256	397,722
Construction and Land Development [Member]
Loans	34,217	27,357
Loans, 90 days past due and still accruing	0	0
Construction and Land Development [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	0	0
Construction and Land Development [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0	0
Construction and Land Development [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Construction and Land Development [Member] | Financial Asset, Past Due [Member]
Loans	0	0
Construction and Land Development [Member] | Financial Asset, Not Past Due [Member]
Loans	34,217	27,357
Residential Portfolio Segment [Member]
Loans	111,032	111,898
Loans, 90 days past due and still accruing	0	0
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	202	0
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0	270
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Residential Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans	202	270
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans	110,830	111,628
Commercial Portfolio Segment [Member]
Loans	51,864	50,405
Loans, 90 days past due and still accruing	0	0
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	0	0
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0	0
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans	0	0
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans	51,864	50,405
Consumer Portfolio Segment [Member]
Loans	133	176
Loans, 90 days past due and still accruing	0	0
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	0	0
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0	0
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Consumer Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans	0	0
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans	$ 133	$ 176