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CONTRACTS AND AGREEMENTS - Brokerage Commissions (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Long Duration Contracts Assumptions By Product And Guarantee [Line Items]
Brokerage commissions	$ 7,832	$ 5,146
Brokerage commissions as a percentage of average daily net assets	0.01%	0.05%
Rebalancing Investments Transaction [Member]
Long Duration Contracts Assumptions By Product And Guarantee [Line Items]
Brokerage commissions	$ 5,548	$ 2,701
Brokerage commissions as a percentage of average daily net assets	70.84%	52.49%
Trades Necessitated By Creation And Redemption Activity [Member]
Long Duration Contracts Assumptions By Product And Guarantee [Line Items]
Brokerage commissions	$ 2,284	$ 2,445
Brokerage commissions as a percentage of average daily net assets	29.16%	47.51%

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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- 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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