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FAIR VALUE OF FINANCIAL INSTRUMENTS - Effect of Derivative Instruments on the Condensed Statements of Operations (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]          
Realized Gain (Loss) on Derivatives Recognized in Income $ 7,019,783 $ 4,794,519   $ 43,542,500 $ 27,005,240
Change in Unrealized Gain (Loss) on Derivatives Recognized in Income       680,157 $ 836,082
Commodity Contracts [Member] | Realized gain (loss) on closed positions [Member] | Futures [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Realized Gain (Loss) on Derivatives Recognized in Income     $ 27,005,240 43,542,500  
Commodity Contracts [Member] | Change in unrealized gain (loss) on open positions [Member] | Futures [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Change in Unrealized Gain (Loss) on Derivatives Recognized in Income     $ 836,082 $ 680,157