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CONTRACTS AND AGREEMENTS - Brokerage Commissions (Details) - USD ($) | 3 Months Ended
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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%

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