Property Loans, Net of Loan Loss Allowances - Summary of Property Loans and Remaining Commitments (Details)	12 Months Ended
	Dec. 31, 2020 USD ($)
Accounts Notes And Loans Receivable [Line Items]
Outstanding Balance	$ 5,327,342
Maximum Remaining Commitment	$ 70,786,838
Scharbauer Flats Apartments [Member]
Accounts Notes And Loans Receivable [Line Items]
Date Committed	2020-06
Original Maturity Date	Jan. 01, 2023	[1]
Outstanding Balance	$ 2,309,613
Maximum Remaining Commitment	$ 21,850,387
Oasis at Twin Lakes [Member]
Accounts Notes And Loans Receivable [Line Items]
Date Committed	2020-07
Original Maturity Date	Aug. 01, 2023	[2]
Maximum Remaining Commitment	$ 27,704,180
Centennial Crossings [Member]
Accounts Notes And Loans Receivable [Line Items]
Date Committed	2020-08
Original Maturity Date	Sep. 01, 2023	[2]
Outstanding Balance	$ 3,017,729
Maximum Remaining Commitment	$ 21,232,271

[1] ^{The borrower has the option to extend the maturity date with two six-month extensions.}

[2] ^{The borrower has the option to extend the maturity date up to six months.}