Note 5 - Loans and Leases - Credit Loss on Unfunded Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Beginning balance	$ 49	$ 62
Provision (benefit) for credit losses	(165)	(13)
Ending balance	944	49
Cumulative Effect, Period of Adoption, Adjustment [Member]
Beginning balance	$ 1,060	0
Ending balance		$ 1,060