Note 5 - Allowance for Loan Losses on Loans and Nonperforming Assets - Details of the Collateral Dependent Loan (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related allowance	$ 9,094	$ 8,225	$ 7,674
Collateral Pledged [Member]
Total Loans	2,184
Related allowance	0
Consumer Real Estate Portfolio Segment [Member]
Related allowance	3,162	2,199	1,930
Consumer Real Estate Portfolio Segment [Member] \| Closed End First Liens [Member] \| Collateral Pledged [Member]
Total Loans	7
Related allowance	0
Commercial Real Estate Portfolio Segment [Member]
Related allowance	3,576	$ 3,642	$ 3,121
Commercial Real Estate Portfolio Segment [Member] \| Commercial Real Estate, Owner Occupied [Member] \| Collateral Pledged [Member]
Total Loans	2,177
Related allowance	$ 0

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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+ Details