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CONTRACTS AND AGREEMENTS - Brokerage Commissions (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Long Duration Contracts Assumptions By Product And Guarantee [Line Items]
Brokerage commissions	$ 5,146	$ 1,872
Brokerage commissions as a percentage of average daily net assets	0.05%	0.01%
Rebalancing Investments Transaction [Member]
Long Duration Contracts Assumptions By Product And Guarantee [Line Items]
Brokerage commissions	$ 2,701	$ 1,823
Brokerage commissions as a percentage of average daily net assets	52.49%	97.38%
Trades Necessitated By Creation And Redemption Activity [Member]
Long Duration Contracts Assumptions By Product And Guarantee [Line Items]
Brokerage commissions	$ 2,445	$ 49
Brokerage commissions as a percentage of average daily net assets	47.51%	2.62%

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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X

- Definition

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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X

- Definition

Percentage of Average Daily Net Assets

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