Note 5 - Mortgage Loan Servicing - Mortgage Loans Serviced for Others (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Mortgage loans serviced for others	$ 1,686,854	$ 1,550,830
Federal Home Loan Mortgage Corporation [Member]
Mortgage loans serviced for others	1,422,337	1,364,485
Federa lHome Loan Bank [Member]
Mortgage loans serviced for others	264,517	176,540
Other [Member]
Mortgage loans serviced for others	$ 0	$ 9,805