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Fair Value of Financial Instruments - Fair Value Financial Instruments (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Interest receivable $ 189,694 $ 184,869
Fair Value    
Cash and equivalents 433,504 2,183,441
Accounts receivable 253,639 251,535
Interest receivable 189,694 184,869
Mortgage loans receivable 23,401,582 23,905,564
Bond portfolio 16,202,937 15,389,807
Secured investor certificates 31,695,185 34,099,540
Carrying Amount    
Cash and equivalents 433,504 2,183,441
Accounts receivable 253,639 251,535
Interest receivable 189,694 184,869
Mortgage loans receivable 21,990,821 23,607,655
Bond portfolio 16,710,937 15,847,807
Secured investor certificates $ 27,551,000 $ 29,386,000