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CONTRACTS AND AGREEMENTS (Brokerage Commissions) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Total commissions accrued to brokers	$ 3,451	$ 6,117	$ 3,918
Total commissions as annualized percentage of average total net assets	0.03%	0.04%	0.02%
Rebalancing Investments Transaction [Member]
Total commissions accrued to brokers	$ 3,305	$ 4,698	$ 2,126
Total commissions as annualized percentage of average total net assets	95.77%	76.80%	54.26%
Creation And Redemption Activity [Member]
Total commissions accrued to brokers	$ 146	$ 1,419	$ 1,792
Total commissions as annualized percentage of average total net assets	4.23%	23.20%	45.74%

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- Definition

Percentage of Average Daily Net Assets

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- 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.

+ References

No definition available.

+ Details

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- Details

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X

- Details

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