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FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value of Derivative Instruments (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Derivatives not Accounted for as Hedging Instruments Futures - Commodity Contracts  
Statements of Financial Condition Location Assets  
Futures - Commodity Contracts $ 1,161,610 $ (6,289,510)