Note 6 - Loan Servicing - Schedule of Principal Balances of Mortgage and SBA Loans Serviced for Others (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Mortgages [Member]
Loans serviced for others	$ 1,041,352	$ 1,127,668
Small Business Administration Loans [Member]
Loans serviced for others	102,605	119,893
Commerical Real Estate Loans [Member]
Loans serviced for others	3,933	3,991
Construction Loans [Member]
Loans serviced for others	$ 4,388	$ 3,677