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Note 5 - Mortgage Loan Servicing - Mortgage Loans Serviced for Others (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Mortgage loans serviced for others $ 1,038,928,000 $ 726,960,000
Federal Home Loan Mortgage Corporation [Member]    
Mortgage loans serviced for others 1,030,211,000 711,643,000
Federa lHome Loan Bank [Member]    
Mortgage loans serviced for others $ 8,717,000 $ 15,317,000