SUBSEQUENT EVENTS (Details) - USD ($)	1 Months Ended	6 Months Ended		94 Months Ended
	Aug. 05, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015
Subsequent events
Repurchase of depository receipts		30,080		1,316,996
Repurchase price of depository receipts		$ 49.63		$ 26.20
Repurchase price of units		$ 1,488.90
Repurchase of depository receipts		$ 1,505,645
Stock Buyback (in units)		1,253	664
Total cost of repurchase		$ 1,879,001	$ 941,477	$ 37,046,000
Class B
Subsequent events
Repurchase of depository receipts				2,690
Repurchase price of units				$ 833.09
Stock Buyback (in units)		238
Total cost of repurchase		$ 354,688	175,019
General Partnership
Subsequent events
Repurchase of depository receipts				142
Stock Buyback (in units)		13
Total cost of repurchase		$ 18,668	$ 9,212
Subsequent event
Subsequent events
Repurchase of depository receipts	4,241
Repurchase price of depository receipts	$ 49.23
Repurchase price of units	$ 1,476.99
Repurchase of depository receipts	$ 215,102
Subsequent event | Class B
Subsequent events
Stock Buyback (in units)	33.6
Total cost of repurchase	$ 49,589
Subsequent event | General Partnership
Subsequent events
Stock Buyback (in units)	1.8
Total cost of repurchase	$ 2,610