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CONTRACTS AND AGREEMENTS - Brokerage Commissions (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Long Duration Contracts Assumptions By Product And Guarantee [Line Items] |  |  |  |
Brokerage commissions | $ 6,442 | $ 15,806 | $ 22,248 | $ 89,983
Brokerage commissions as a percentage of average daily net assets | 0.02% | 0.07% | 0.02% | 0.07%
Rebalancing Investments Transaction [Member] |  |  |  |
Long Duration Contracts Assumptions By Product And Guarantee [Line Items] |  |  |  |
Brokerage commissions |  |  | $ 14,868 | $ 26,140
Brokerage commissions as a percentage of average daily net assets | 66.83% | 29.05% | 66.83% | 29.05%
Trades Necessitated By Creation And Redemption Activity [Member] |  |  |  |
Long Duration Contracts Assumptions By Product And Guarantee [Line Items] |  |  |  |
Brokerage commissions |  |  | $ 7,380 | $ 63,843
Brokerage commissions as a percentage of average daily net assets | 33.17% | 70.95% | 33.17% | 70.95%

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