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CONTRACTS AND AGREEMENTS (Brokerage Commissions) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Long Duration Contracts Assumptions By Product And Guarantee [Line Items]
Brokerage commissions	$ 3,747	$ 3,728	$ 12,416	$ 10,165
Brokerage commissions as a percentage of average daily net assets	0.02%	0.03%	0.02%	0.03%
Rebalancing Investments Transaction [Member]
Long Duration Contracts Assumptions By Product And Guarantee [Line Items]
Brokerage commissions			$ 8,959	$ 6,247
Brokerage commissions as a percentage of average daily net assets	72.16%	61.46%	72.16%	61.46%
Trades Necessitated By Creation And Redemption Activity [Member]
Long Duration Contracts Assumptions By Product And Guarantee [Line Items]
Brokerage commissions			$ 3,457	$ 3,918
Brokerage commissions as a percentage of average daily net assets	27.84%	38.54%	27.84%	38.54%

X

- Definition

The amount of expense during the period for floor brokerage fees paid to other broker-dealers to execute trades on their behalf, stock exchange fees, order flow fees, and clearance fees.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Percentage of Average Daily Net Assets

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