Note 4 - Loans and the Allowance for Credit Losses - Aging of Modified Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Modified	$ 17,798
Commercial Portfolio Segment [Member]
Modified	10,317
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Modified	10,317
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
Commercial Real Estate Portfolio Segment [Member]
Modified	7,481
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Modified	7,481
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Modified	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified	$ 0