Note 5 - Loans and the Allowance for Credit Losses - Rollforward of Allowance for Credit Losses for Unfunded Commitments (Details) - Unfunded Loan Commitment [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Balance at beginning of period	$ 3,064	$ 2,262	$ 3,036	$ 2,351
Provision for (reversal of) credit losses - unfunded commitments	(245)	61	(217)	(28)
Balance at end of period	$ 2,819	$ 2,323	$ 2,819	$ 2,323