Note 2 - Loans and Allowance for Credit Losses - Allowance for Credit Losses on Unfunded Commitments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Balance			$ 8,225	$ 7,674	$ 7,674
(Recovery of) provision for credit losses	$ (401)	$ 252	(389)	696	706
Balance	10,181	$ 8,207	10,181	$ 8,207	8,225
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance			2,342
Balance					2,342
Unfunded Loan Commitment [Member]
Balance			35
(Recovery of) provision for credit losses			21
Balance	$ 263		263		35
Unfunded Loan Commitment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance			$ 207
Balance					$ 207