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CONTRACTS AND AGREEMENTS - Brokerage Commissions (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Long Duration Contracts Assumptions By Product And Guarantee [Line Items] |  |  |  |
Brokerage commissions | $ 7,974 | $ 69,031 | $ 15,806 | $ 74,177
Brokerage commissions as a percentage of average daily net assets | 0.02% | 0.11% | 0.02% | 0.11%
Rebalancing Investments Transaction [Member] |  |  |  |
Long Duration Contracts Assumptions By Product And Guarantee [Line Items] |  |  |  |
Brokerage commissions |  |  | $ 10,913 | $ 16,605
Brokerage commissions as a percentage of average daily net assets | 69.04% | 22.39% | 69.04% | 22.39%
Trades Necessitated By Creation And Redemption Activity [Member] |  |  |  |
Long Duration Contracts Assumptions By Product And Guarantee [Line Items] |  |  |  |
Brokerage commissions |  |  | $ 4,893 | $ 57,572
Brokerage commissions as a percentage of average daily net assets | 30.96% | 77.61% | 30.96% | 77.61%

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