Note 9 - Allowance for Loan Losses and Credit Quality Information - Non-accrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Non-accrual loans	$ 4,293	$ 4,621
Residential Portfolio Segment [Member]
Non-accrual loans	565	340
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Non-accrual loans	3,286	3,757
Consumer Portfolio Segment [Member]
Non-accrual loans	436	517
Commercial Portfolio Segment [Member]
Non-accrual loans	$ 6	$ 7