Note 5 - Loans - Performance of Modified Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Modified	$ 2,872
Financial Asset, Not Past Due [Member]
Modified	2,872
Financial Asset, 30 to 89 Days Past Due [Member]
Modified	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified	0
Commercial Portfolio Segment [Member]
Modified	2,650
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Modified	2,650
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Modified	0
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified	0
Residential Mortgage Loans [Member]
Modified	222
Residential Mortgage Loans [Member] | Financial Asset, Not Past Due [Member]
Modified	222
Residential Mortgage Loans [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Modified	0
Residential Mortgage Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified	$ 0