INVESTMENTS IN OPERATING PARTNERSHIPS - Contributions payable (Details) - USD ($)	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019
Contributions Payable
Capital contributions payable	$ 1,039	$ 1,039	$ 19,094
Series Twenty Nine [Member]
Contributions Payable
Capital contributions payable	785	785	785
Series Thirty Two [Member]
Contributions Payable
Capital contributions payable	0	0	1,229
Series Forty [Member]
Contributions Payable
Capital contributions payable	0	0	102
Series Forty Two [Member]
Contributions Payable
Capital contributions payable	254	254	254
Series Forty Five [Member]
Contributions Payable
Capital contributions payable	$ 0	$ 0	$ 16,724