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FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value of Derivative Instruments (Details) - USD ($) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2020 | Dec. 31, 2019
Commodity Contracts [Member] | Futures - Commodity Contracts [Member] | Assets [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivatives not Accounted for as Hedging Instruments | $ 1,356,010 | $ (20,768,690)

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