Note 9 - Allowance for Credit Losses and Credit Quality Information - Provision for Credit Losses (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Loans (1)	[1]	$ 444	$ 579	$ 612	$ 941
Unfunded commitments(1)		(126)		(46)
Total	[2]	$ 318	$ 579	$ 566	$ 941

[1] The Company adopted ASU 2016-13 as of January 1, 2023. The 2022 amounts presented are calculated under the prior accounting standard.

[2] The Company adopted Accounting Standard Update (ASU) 2016-13 as of January 1, 2023. The 2022 amount presented is calculated under the prior accounting standard.