Mortgage Loans Receivable and Bond Portfolio - Restructured and Modified Loans (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Notes to Financial Statements
Number of Loans	$ 7	$ 7
Original Principal Balance	4,415,544	4,415,544
Original Average Interest Rate	8	8
Unpaid Principal Balance	3,444,462	3,838,819
Modified Average Interest Rate	$ 6	$ 6