Note 12 - Commitments and Off-balance-sheet Risk (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	$ 49,914	$ 42,246	$ 35,363	$ 37,967
Term Debt, Secured by Real Estate Balloon Payment, Period (Year)	5 years
Minimum [Member]
Amortization Period for Term Debt, Secured by Real Estate (Year)	10 years
Term Debt Secured, by Non-real Estate Collateral Maturity Period (Year)	3 years
Maximum [Member]
Amortization Period for Term Debt, Secured by Real Estate (Year)	25 years
Term Debt Secured, by Non-real Estate Collateral Maturity Period (Year)	7 years
Retail and Commercial Lines of Credit and Credit Card Receivables [Member]
Financing Receivable, Allowance for Credit Loss	$ 1,300	$ 100
Commercial Line of Credit Facilities [Member] | Minimum [Member]
Line of Credit Facility, Expiration Period (Month)	12 months
Commercial Line of Credit Facilities [Member] | Maximum [Member]
Line of Credit Facility, Expiration Period (Month)	24 months