Note 4 - Loans and the Allowance for Credit Losses - Rollforward of Allowance for Credit Losses for Unfunded Commitments (Details) - Unfunded Loan Commitment [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Balance as of beginning of period	$ 3,035	$ 2,351
(Reversal of) provision for credit losses - unfunded commitments	(224)	684
Balance as of end of period	$ 2,811	$ 3,035