Note 9 - Allowance for Loan Losses and Credit Quality Information - Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Troubled debt restructurings	$ 746	$ 1,051
Performing Financial Instruments [Member]
Troubled debt restructurings	201	29
Nonperforming Financial Instruments [Member]
Troubled debt restructurings	545	1,022
Residential Portfolio Segment [Member]
Troubled debt restructurings	206	254
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]
Troubled debt restructurings	0	0
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Troubled debt restructurings	206	254
Commercial Real Estate Portfolio Segment [Member]
Troubled debt restructurings	179	355
Commercial Real Estate Portfolio Segment [Member] | Performing Financial Instruments [Member]
Troubled debt restructurings	179	0
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Troubled debt restructurings	0	355
Consumer Portfolio Segment [Member]
Troubled debt restructurings	361	442
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member]
Troubled debt restructurings	22	29
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Troubled debt restructurings	$ 339	$ 413