Note 5 - Allowance for Credit Losses - Loans and Reserve for Unfunded Lending Commitments (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss	$ 25,273	$ 19,555	$ 18,678	$ 21,403
Financing Receivable, Credit Loss, Expense (Reversal)	433	$ 1,597	$ (2,825)
SBA CARES Act Paycheck Protection Program [Member]
Financing Receivable, Allowance for Credit Loss	$ 0