Property Loans, Net of Loan Loss Allowances - Summary of Partnership's Property Loans, Net of Loan Loss Allowances (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	$ 15,392,908	$ 23,354,826
Loan Loss Allowance	(7,393,814)	(7,393,814)	$ (7,393,814)
Property Loan Principal, net of allowance	7,999,094	15,961,012
Arbors at Hickory Ridge [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	191,264	191,264
Property Loan Principal, net of allowance	191,264	191,264
Avistar (February 2013 Portfolio) [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	201,972	201,972
Property Loan Principal, net of allowance	201,972	201,972
Avistar (June 2013 Portfolio) [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	251,622	251,622
Property Loan Principal, net of allowance	251,622	251,622
Cross Creek [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	11,101,887	11,101,887
Loan Loss Allowance	(7,393,814)	(7,393,814)
Property Loan Principal, net of allowance	3,708,073	3,708,073
Greens Property [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	850,000	850,000
Property Loan Principal, net of allowance	850,000	850,000
Live 929 Apartments [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	405,717
Property Loan Principal, net of allowance	405,717
Ohio Properties [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	2,390,446	2,390,446
Property Loan Principal, net of allowance	$ 2,390,446	2,390,446
Vantage at Brooks LLC [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance		8,367,635
Property Loan Principal, net of allowance		$ 8,367,635