Note 6 - Allowance for Loan Losses and Credit Quality Information - Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Troubled debt restructurings	$ 790	$ 1,051
Residential Portfolio Segment [Member]
Troubled debt restructurings	202	254
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Troubled debt restructurings	179	355
Consumer Portfolio Segment [Member]
Troubled debt restructurings	378	442
Commercial Portfolio Segment [Member]
Troubled debt restructurings	$ 31	$ 0