Note 9 - Loans - Amortized Cost of Modified Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Modified	$ 2,653	$ 4,014	$ 2,688	$ 10,849
Extended Maturity [Member]
Modified	1,489		1,489
Rate Reduction and Term Extension and Payment Deferral [Member]
Modified	1,164		1,199
Commercial Portfolio Segment [Member]
Modified	$ 2,653	$ 2,572	$ 2,688	$ 6,115
% of total loans	0.09%		0.09%
Weighted average rate reduction	0.94%		1.27%
Weighted average term increase (Year)	9 months 18 days		9 months 18 days
Weighted average payment deferral (Year)	4 months 24 days		4 months 20 days
Commercial Portfolio Segment [Member] | Extended Maturity [Member]
Modified	$ 1,489		$ 1,489
Commercial Portfolio Segment [Member] | Rate Reduction and Term Extension and Payment Deferral [Member]
Modified	$ 1,164		$ 1,199