RELATED PARTY TRANSACTIONS - Fund management fees accrued (Details) - USD ($)	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Related Party Transaction [Line Items]
Gross Fund Management Fee	$ 229,604	$ 405,112
Series Twenty [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	0	0
Series Twenty One [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	0	0
Series Twenty Two [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	0	0
Series Twenty Three [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	0	0
Series Twenty Four [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	0	10,299
Series Twenty Five [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	0	0
Series Twenty Six [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	4,282	13,938
Series Twenty Seven [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	0	7,635
Series Twenty Eight [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	0	7,296
Series Twenty Nine [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	6,854	7,260
Series Thirty [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	0	0
Series Thirty One [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	0	4,308
Series Thirty Two [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	15,132	19,794
Series Thirty Three [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	9,777	13,318
Series Thirty Four [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	6,727	12,365
Series Thirty Five [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	0	10,653
Series Thirty Six [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	0	5,172
Series Thirty Seven [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	0	0
Series Thirty Eight [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	0	16,581
Series Thirty Nine [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	0	0
Series Forty [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	0	20,870
Series Forty One [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	28,521	34,077
Series Forty Two [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	19,259	23,790
Series Forty Three [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	21,348	31,111
Series Forty Four [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	30,315	54,702
Series Forty Five [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	38,900	59,644
Series Forty Six [Member]
Related Party Transaction [Line Items]
Gross Fund Management Fee	$ 48,489	$ 52,299