TREASURY UNITS (Details)				1 Months Ended		3 Months Ended			6 Months Ended	132 Months Ended	142 Months Ended
	Mar. 10, 2015 shares	Aug. 31, 2007 $ / item shares	Aug. 20, 2007 shares	May 08, 2020 USD ($) $ / item shares	Sep. 30, 2007 $ / item shares	Mar. 31, 2020 USD ($) $ / item shares	Mar. 31, 2019 USD ($) $ / item shares	Dec. 31, 2007 $ / item shares	Jun. 30, 2019 $ / item shares	Dec. 31, 2018 $ / item shares	Jun. 30, 2019 USD ($) $ / item	Mar. 06, 2008 shares
Treasury units						58,466
Period for repurchase of depository receipts	5 years		12 months
Depository receipts authorized to be repurchased	2,000,000		300,000									1,500,000
Number of depository receipts repurchased		14,283			14,283			14,283	14,283	14,283
Repurchase price of depository receipts (in dollars per receipt) | $ / item											28.42
Units required to be repurchased (in shares)						219	1,795
Total cost of repurchase | $						$ 389,947	$ 2,930,736				$ 44,714,000
Subsequent event
Number of depository receipts repurchased				76
Repurchase price of depository receipts (in dollars per receipt) | $ / item				42.95
Total cost of repurchase | $				$ 3,265
General Partnership
Treasury units						585
Fixed distribution percentage of unit holders						1.00%
Number of depository receipts repurchased		188			188		188			188
Total cost of repurchase | $						$ 311,952	$ 29,307
Value of units required to be repurchased | $						$ 3,898
Repurchases required (in units)						2.2
General Partnership | Subsequent event
Value of units required to be repurchased | $				$ 41
Treasury Units
Units required to be repurchased (in shares)						219	1,795
Class A
Treasury units						46,772
Fixed distribution percentage of unit holders						80.00%
Repurchase price of units (in dollars per unit) | $ / item		852.60			852.60		852.60			852.60
Total cost of repurchase | $						$ 74,095	$ 2,344,601
Class B
Treasury units						11,109
Fixed distribution percentage of unit holders						19.00%
Number of depository receipts repurchased		3,571			3,571		3,571			3,571
Total cost of repurchase | $						$ 3,900	$ 556,828
Class B | Subsequent event
Units required to be repurchased (in shares)				0.6
Value of units required to be repurchased | $				$ 775
Class B
Value of units required to be repurchased | $						$ 7,406
Class B | General Partnership
Repurchase price of units (in dollars per unit) | $ / item		1,032.98			1,032.98			1,032.98	1,032.98	1,032.98
Repurchases required (in units)						41.6
Treasury Units
Repurchase price of depository receipts (in dollars per receipt) | $ / item						59.38
Units required to be repurchased (in shares)						5,252
Repurchase price of units (in dollars per unit) | $ / item						1,781.40
Total cost of repurchase | $						$ 311,951