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CONTRACTS AND AGREEMENTS - Brokerage and Futures Commissions (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Total commissions accrued to brokers	$ 312	$ 434	$ 948	$ 1,219
Total commissions as annualized percentage of average total net assets	0.03%	0.02%	0.03%	0.02%
Rebalancing Investments Transaction [Member]
Total commissions accrued to brokers			$ 850	$ 909
Total commissions as annualized percentage of average total net assets	89.66%	74.57%	89.66%	74.57%
Creation And Redemption Activity [Member]
Total commissions accrued to brokers			$ 98	$ 310
Total commissions as annualized percentage of average total net assets	10.34%	25.43%	10.34%	25.43%

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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.

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No definition available.

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