INVESTMENTS IN OPERATING PARTNERSHIPS - Contributions payable (Details) - USD ($)	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018
Contributions Payable
Capital contributions payable	$ 18,992	$ 44,094	$ 137,645
Series Twenty Nine [Member]
Contributions Payable
Capital contributions payable	785	785	785
Series Thirty [Member]
Contributions Payable
Capital contributions payable	0	0	48,627
Series Thirty One [Member]
Contributions Payable
Capital contributions payable	0	25,000	43,842
Series Thirty Two [Member]
Contributions Payable
Capital contributions payable	1,229	1,229	1,229
Series Thirty Three [Member]
Contributions Payable
Capital contributions payable	0	0
Series Forty [Member]
Contributions Payable
Capital contributions payable	0	102	102
Series Forty One [Member]
Contributions Payable
Capital contributions payable	0	0
Series Forty Two [Member]
Contributions Payable
Capital contributions payable	254	254	254
Series Forty Three [Member]
Contributions Payable
Capital contributions payable	0	0	26,082
Series Forty Five [Member]
Contributions Payable
Capital contributions payable	$ 16,724	$ 16,724	$ 16,724