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CONTRACTS AND AGREEMENTS - Brokerage Commissions (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Long Duration Contracts Assumptions By Product And Guarantee [Line Items]        
Brokerage commissions $ 15,806 $ 1,627 $ 89,983 $ 5,484
Brokerage commissions as a percentage of average daily net assets 0.07% 0.01% 0.07% 0.01%
Rebalancing Investments Transaction [Member]        
Long Duration Contracts Assumptions By Product And Guarantee [Line Items]        
Brokerage commissions     $ 26,140 $ 5,021
Brokerage commissions as a percentage of average daily net assets 29.05% 91.56% 29.05% 91.56%
Trades Necessitated By Creation And Redemption Activity [Member]        
Long Duration Contracts Assumptions By Product And Guarantee [Line Items]        
Brokerage commissions     $ 63,843 $ 463
Brokerage commissions as a percentage of average daily net assets 70.95% 8.44% 70.95% 8.44%