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CONTRACTS AND AGREEMENTS - Brokerage and Futures Commissions Merchant Agreements (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Total commissions accrued to brokers $ 787 $ 131
Total commissions as annualized percentage of average total net assets 0.04% 0.02%
Rebalancing Investments Transaction [Member]    
Total commissions accrued to brokers $ 426 $ 131
Total commissions as annualized percentage of average total net assets 54.13% 100.00%
Creation And Redemption Activity [Member]    
Total commissions accrued to brokers $ 361  
Total commissions as annualized percentage of average total net assets 45.87%