Note 5 - Loans - Troubled Debt Restructuring (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
No. of Contracts		15	5
Pre-modification		$ 11,980	$ 2,153
Post-modification	$ 2,872	11,946	2,153
Specific Reserve		427	0
Charge-offs		$ 0	$ 0
Commercial Portfolio Segment [Member]
No. of Contracts		4	3
Pre-modification		$ 6,115	$ 2,150
Post-modification	$ 2,650	6,115	2,150
Specific Reserve		427	0
Charge-offs		$ 0	$ 0
Commercial Real Estate Portfolio Segment [Member]
No. of Contracts		3
Pre-modification		$ 3,676
Post-modification		3,669
Specific Reserve		$ 0
Residential Mortgage and Equity Lines Portfolio Segment [Member]
No. of Contracts		8	2
Pre-modification		$ 2,189	$ 3
Post-modification		2,162	3
Specific Reserve		$ 0	0
Charge-offs			$ 0