Note 5 - Allowance for Credit Losses - Nonaccrual (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Nonaccrual, no allowance	$ 1,130	$ 438
Nonaccrual, with allowance	461	0
Commercial Portfolio Segment [Member]
Nonaccrual, no allowance	0	0
Nonaccrual, with allowance	49	0
Commercial Real Estate Portfolio Segment [Member]
Nonaccrual, no allowance	5	0
Nonaccrual, with allowance	0	0
Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Nonaccrual, no allowance	1,073	420
Nonaccrual, with allowance	410	0
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Nonaccrual, no allowance	25	0
Nonaccrual, with allowance	0	0
Consumer Portfolio Segment [Member] | Consumer, Other [Member]
Nonaccrual, no allowance	0	0
Nonaccrual, with allowance	2	0
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Nonaccrual, no allowance	27	18
Nonaccrual, with allowance	$ 0	$ 0