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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
Brokerage commissions $ 205,173 $ 25,440 $ 251,852 $ 51,724
Percentage Of Average Daily Net Assets 0.25% 0.11% 0.25% 0.11%
Rebalancing Investments Transaction [Member]        
Brokerage commissions     $ 217,371 $ 50,744
Percentage Of Average Daily Net Assets 86.31% 98.11% 86.31% 98.11%
Creation And Redemption Activity [Member]        
Brokerage commissions     $ 34,481 $ 980
Percentage Of Average Daily Net Assets 13.69% 1.89% 13.69% 1.89%