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Mortgage Loans Receivable and Bond Portfolio - Restructured Loans (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Notes to Financial Statements    
Number of Loans $ 6 $ 6
Original Principal Balance 4,100,544 4,100,544
Original Average Interest Rate 8 8
Unpaid Principal Balance 3,164,996 3,185,720
Modified Average Interest Rate $ 6 $ 6