Note 6 - Allowance for Credit Losses and Credit Quality Information - Summary of Troubled Debt Restructurings (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Modified	$ 364
Residential Portfolio Segment [Member]
Number of loan	1
Modified	$ 217
Residential Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Number of loan	1
Residential Portfolio Segment [Member] | Extended Maturity [Member]
Number of loan	1
Commercial Real Estate Portfolio Segment [Member]
Number of loan	1
Modified	$ 93
Commercial Real Estate Portfolio Segment [Member] | Payment Deferral [Member]
Number of loan	1
Consumer Portfolio Segment [Member]
Number of loan	4
Modified	$ 54
Consumer Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Number of loan	1
Consumer Portfolio Segment [Member] | Extended Maturity [Member]
Number of loan	3
Consumer Portfolio Segment [Member] | Payment Deferral [Member]
Number of loan	1