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Fair Value of Financial Instruments - Fair Value Financial Instruments (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Cash and equivalents $ 47,170 $ 191,987
Fair Value    
Cash and equivalents 47,170 191,987
Accounts receivable 109,797 125,539
Interest receivable 186,970 185,190
Mortgage loans receivable 24,080,303 24,573,176
Bond portfolio 17,448,937 16,055,937
Secured investor certificates 30,626,505 32,389,253
Carrying Amount    
Cash and equivalents 47,170 191,987
Accounts receivable 109,797 125,539
Interest receivable 186,970 185,190
Mortgage loans receivable 19,550,551 22,425,177
Bond portfolio 17,448,937 16,055,937
Secured investor certificates $ 26,105,000 $ 26,850,000