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CONTRACTS AND AGREEMENTS - Brokerage Commissions (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Long Duration Contracts Assumptions By Product And Guarantee [Line Items] |  |  |  |
Brokerage commissions | $ 69,031 | $ 1,985 | $ 74,177 | $ 3,857
Brokerage commissions as a percentage of average daily net assets | 0.11% | 0.01% | 0.11% | 0.01%
Rebalancing Investments Transaction [Member] |  |  |  |
Long Duration Contracts Assumptions By Product And Guarantee [Line Items] |  |  |  |
Brokerage commissions |  |  | $ 16,605 | $ 3,446
Brokerage commissions as a percentage of average daily net assets | 22.39% | 89.34% | 22.39% | 89.34%
Trades Necessitated By Creation And Redemption Activity [Member] |  |  |  |
Long Duration Contracts Assumptions By Product And Guarantee [Line Items] |  |  |  |
Brokerage commissions |  |  | $ 57,572 | $ 411
Brokerage commissions as a percentage of average daily net assets | 77.61% | 10.66% | 77.61% | 10.66%

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