Note 5 - Allowance for Credit Losses - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Gross loans, before fee	$ 901,624	$ 437,158
Real Estate [Member]
Gross loans, before fee	2,172	687
Other Collateral [Member]
Gross loans, before fee	49	0
Collateral Pledged [Member]
Gross loans, before fee	2,221	687
Commercial Portfolio Segment [Member]
Gross loans, before fee	161,695	87,990
Commercial Portfolio Segment [Member] | Real Estate [Member]
Gross loans, before fee	0	97
Commercial Portfolio Segment [Member] | Other Collateral [Member]
Gross loans, before fee	49	0
Commercial Portfolio Segment [Member] | Collateral Pledged [Member]
Gross loans, before fee	49	97
Commercial Real Estate Portfolio Segment [Member]
Gross loans, before fee	341,595	212,595
Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Gross loans, before fee	5	0
Commercial Real Estate Portfolio Segment [Member] | Other Collateral [Member]
Gross loans, before fee	0	0
Commercial Real Estate Portfolio Segment [Member] | Collateral Pledged [Member]
Gross loans, before fee	5	0
Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Gross loans, before fee	354,070	121,345
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans, before fee	31,224	7,186
Residential Portfolio Segment [Member] | Real Estate [Member] | Real Estate Loan [Member]
Gross loans, before fee	2,142	590
Residential Portfolio Segment [Member] | Real Estate [Member] | Home Equity Loan [Member]
Gross loans, before fee	25	0
Residential Portfolio Segment [Member] | Other Collateral [Member] | Real Estate Loan [Member]
Gross loans, before fee	0	0
Residential Portfolio Segment [Member] | Other Collateral [Member] | Home Equity Loan [Member]
Gross loans, before fee	0	0
Residential Portfolio Segment [Member] | Collateral Pledged [Member] | Real Estate Loan [Member]
Gross loans, before fee	2,142	590
Residential Portfolio Segment [Member] | Collateral Pledged [Member] | Home Equity Loan [Member]
Gross loans, before fee	25	0
Consumer Portfolio Segment [Member] | Consumer, Other [Member]
Gross loans, before fee	4,442	1,526
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Gross loans, before fee	8,598	6,516
Consumer Portfolio Segment [Member] | Real Estate [Member] | Consumer, Other [Member]
Gross loans, before fee	0	0
Consumer Portfolio Segment [Member] | Real Estate [Member] | Automobile Loan [Member]
Gross loans, before fee	0	0
Consumer Portfolio Segment [Member] | Other Collateral [Member] | Consumer, Other [Member]
Gross loans, before fee	0	0
Consumer Portfolio Segment [Member] | Other Collateral [Member] | Automobile Loan [Member]
Gross loans, before fee	0	0
Consumer Portfolio Segment [Member] | Collateral Pledged [Member] | Consumer, Other [Member]
Gross loans, before fee	0	0
Consumer Portfolio Segment [Member] | Collateral Pledged [Member] | Automobile Loan [Member]
Gross loans, before fee	$ 0	$ 0