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CONTRACTS AND AGREEMENTS - Brokerage Commissions (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Brokerage commissions	$ 25,440	$ 24,361	$ 51,724	$ 48,093
Percentage Of Average Daily Net Assets	0.11%	0.10%	0.11%	0.10%
Rebalancing Investments Transaction [Member]
Brokerage commissions			$ 50,744	$ 46,242
Percentage Of Average Daily Net Assets	98.11%	96.15%	98.11%	96.15%
Creation And Redemption Activity [Member]
Brokerage commissions			$ 980	$ 1,851
Percentage Of Average Daily Net Assets	1.89%	3.85%	1.89%	3.85%

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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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