Loans Held for Investment - Activity of loan receivables - subnote (Details)	3 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Jan. 09, 2019 USD ($) a
Accounts, Notes, Loans and Financing Receivable [Line Items]
Paid-in-Kind Interest	$ 80,116	$ 657,700
Area of Land | a			4.9
Obligations Under Participation Agreements
Accounts, Notes, Loans and Financing Receivable [Line Items]
Paid-in-Kind Interest	$ 200,000	$ 200,000
First Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Area of Land | a			4.9
Mortgage Loans in Process of Foreclosure, Amount			$ 14,300,000.0