Loans Held for Investment - Geographic Locations (Details)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Balance	$ 402,687,438	$ 377,388,317
Carrying value	$ 402,969,513	$ 378,612,768
Percent Of Loan Portfolio Holdings	100.00%	100.00%
Allowance for Loan and Lease Losses, Real Estate	$ (1,144,994)	$ 0
Percent Of Allowance Of Loan Losses	(0.003)	0
California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Balance	$ 178,222,394	$ 150,988,463
Carrying value	$ 178,498,419	$ 151,108,109
Percent Of Loan Portfolio Holdings	44.30%	39.90%
New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Balance	$ 74,681,066	$ 79,734,323
Carrying value	$ 74,830,437	$ 79,896,663
Percent Of Loan Portfolio Holdings	18.60%	21.10%
Georgia
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Balance	$ 64,832,131	$ 61,772,764
Carrying value	$ 65,075,669	$ 61,957,443
Percent Of Loan Portfolio Holdings	16.10%	16.40%
North Carolina
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Balance	$ 32,651,847	$ 32,592,767
Carrying value	$ 32,829,933	$ 32,766,311
Percent Of Loan Portfolio Holdings	8.10%	8.70%
Washington
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Balance	$ 23,500,000	$ 23,500,000
Carrying value	$ 23,666,693	$ 23,661,724
Percent Of Loan Portfolio Holdings	5.90%	6.20%
Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Balance	$ 4,004,877	$ 8,004,877
Carrying value	$ 4,039,438	$ 8,071,562
Percent Of Loan Portfolio Holdings	1.00%	2.10%
Massachusetts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Balance	$ 7,000,000	$ 7,000,000
Carrying value	$ 7,000,000	$ 7,000,000
Percent Of Loan Portfolio Holdings	1.70%	1.80%
Kansas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Balance	$ 6,200,000	$ 6,200,000
Carrying value	$ 6,253,504	$ 6,251,649
Percent Of Loan Portfolio Holdings	1.60%	1.70%
Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Balance	$ 3,500,000	$ 3,500,000
Carrying value	$ 3,532,794	$ 3,531,776
Percent Of Loan Portfolio Holdings	0.90%	0.90%
Other (1)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Balance	$ 8,095,123	$ 4,095,123
Carrying value	$ 8,387,620	$ 4,367,531
Percent Of Loan Portfolio Holdings	2.10%	1.20%