Note 4 - Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
With no related allowance recorded, carrying value	$ 5,135	$ 3,937
Related allowance	1,378	19	$ 21
Collateral Pledged [Member]
With no related allowance recorded, carrying value	3,308	123
Related allowance	1,251	0
Commercial and Industrial Portfolio Segment [Member]
With no related allowance recorded, carrying value	1,431	107
Related allowance	121	2	4
Commercial and Industrial Portfolio Segment [Member] | Collateral Pledged [Member]
With no related allowance recorded, carrying value	0	0
Related allowance	0	0
Commercial Real Estate Portfolio Segment [Member]
With no related allowance recorded, carrying value	3,205	3,293
Related allowance	1,204	12	11
Commercial Real Estate Portfolio Segment [Member] | Collateral Pledged [Member] | Owner Occupied [Member]
With no related allowance recorded, carrying value	48	72
Related allowance	0	0
Commercial Real Estate Portfolio Segment [Member] | Collateral Pledged [Member] | Non-owner Occupied [Member]
With no related allowance recorded, carrying value	2,642	0
Related allowance	1,201	0
Commercial Real Estate Portfolio Segment [Member] | Collateral Pledged [Member] | Farmland [Member]
With no related allowance recorded, carrying value	16	51
Related allowance	0	0
Commercial Real Estate Portfolio Segment [Member] | Collateral Pledged [Member] | Multifamily Loans [Member]
With no related allowance recorded, carrying value	0	0
Related allowance	0	0
Commercial Real Estate Portfolio Segment [Member] | Collateral Pledged [Member] | Construction Loans [Member]
With no related allowance recorded, carrying value	0	0
Related allowance	0	0
Residential Portfolio Segment [Member]
With no related allowance recorded, carrying value	499	537
Related allowance	53	5	6
Residential Portfolio Segment [Member] | Collateral Pledged [Member] | Secured By Junior Liens on 1-4 Family Dwellings [Member]
With no related allowance recorded, carrying value	527	0
Related allowance	50	0
Residential Portfolio Segment [Member] | Collateral Pledged [Member] | Secured By Senior Liens On 1-4 Family Dwellings [Member]
With no related allowance recorded, carrying value	0	0
Related allowance	0	0
Residential Portfolio Segment [Member] | Collateral Pledged [Member] | Home Equity Line-of-credit loans [Member]
With no related allowance recorded, carrying value	75	0
Related allowance	0	0
Consumer Portfolio Segment [Member]
With no related allowance recorded, carrying value	0	0
Related allowance	0	0	0
Consumer Portfolio Segment [Member] | Collateral Pledged [Member]
With no related allowance recorded, carrying value	0	0
Related allowance	0	0
Agricultural Portfolio [Member]
With no related allowance recorded, carrying value	0	0
Related allowance	0	0	0
Agricultural Portfolio [Member] | Collateral Pledged [Member]
With no related allowance recorded, carrying value	0	0
Related allowance	0	0
Other Loans [Member]
With no related allowance recorded, carrying value	0	0
Related allowance	0	0	$ 0
Other Loans [Member] | Collateral Pledged [Member]
With no related allowance recorded, carrying value	0	0
Related allowance	$ 0	$ 0