Note 5 - Allowance for Credit Losses - Past Due (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Gross loans, before fee	$ 901,624	$ 437,158
Loans, nonaccrual	1,591	438
Financing Receivables, 30 to 89 Days Past Due [Member]
Gross loans, before fee	5,071	423
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Gross loans, before fee	0	0
Financial Asset, Past Due [Member]
Gross loans, before fee	6,662	861
Financial Asset, Not Past Due [Member]
Gross loans, before fee	894,962	436,297
Commercial Portfolio Segment [Member]
Gross loans, before fee	161,695	87,990
Loans, nonaccrual	49	0
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Gross loans, before fee	1,394	18
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Gross loans, before fee	0	0
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Gross loans, before fee	1,443	18
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Gross loans, before fee	160,252	87,972
Commercial Real Estate Portfolio Segment [Member]
Gross loans, before fee	341,595	212,595
Loans, nonaccrual	5	0
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Gross loans, before fee	201	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Gross loans, before fee	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Gross loans, before fee	206	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Gross loans, before fee	341,389	212,595
Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Gross loans, before fee	354,070	121,345
Loans, nonaccrual	1,483	420
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans, before fee	31,224	7,186
Loans, nonaccrual	25	0
Residential Portfolio Segment [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Real Estate Loan [Member]
Gross loans, before fee	3,160	282
Residential Portfolio Segment [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Home Equity Loan [Member]
Gross loans, before fee	136	0
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Loan [Member]
Gross loans, before fee	0	0
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Home Equity Loan [Member]
Gross loans, before fee	0	0
Residential Portfolio Segment [Member] | Financial Asset, Past Due [Member] | Real Estate Loan [Member]
Gross loans, before fee	4,643	702
Residential Portfolio Segment [Member] | Financial Asset, Past Due [Member] | Home Equity Loan [Member]
Gross loans, before fee	161	0
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Real Estate Loan [Member]
Gross loans, before fee	349,427	120,643
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Home Equity Loan [Member]
Gross loans, before fee	31,063	7,186
Consumer Portfolio Segment [Member] | Consumer, Other [Member]
Gross loans, before fee	4,442	1,526
Loans, nonaccrual	2	0
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Gross loans, before fee	8,598	6,516
Loans, nonaccrual	27	18
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Consumer, Other [Member]
Gross loans, before fee	56	2
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] | Automobile Loan [Member]
Gross loans, before fee	124	121
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer, Other [Member]
Gross loans, before fee	0	0
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Automobile Loan [Member]
Gross loans, before fee	0	0
Consumer Portfolio Segment [Member] | Financial Asset, Past Due [Member] | Consumer, Other [Member]
Gross loans, before fee	58	2
Consumer Portfolio Segment [Member] | Financial Asset, Past Due [Member] | Automobile Loan [Member]
Gross loans, before fee	151	139
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Consumer, Other [Member]
Gross loans, before fee	4,384	1,524
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Automobile Loan [Member]
Gross loans, before fee	$ 8,447	$ 6,377