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FAIR VALUE OF FINANCIAL INSTRUMENTS - Effect of Derivative Instruments on Statements of Operations (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss)
Change in Unrealized Gain (Loss) on Derivatives Recognized in Income	$ 231,913,525	$ (312,173,308)	$ 6,489,790
Commodity Contracts | Realized gain (loss) on closed positions
Derivative Instruments, Gain (Loss)
Realized Gain (Loss) on Derivatives Recognized in Income	220,179,889	1,603,334	70,673,279
Commodity Contracts | Change in unrealized gain (loss) on open positions
Derivative Instruments, Gain (Loss)
Change in Unrealized Gain (Loss) on Derivatives Recognized in Income	$ 231,913,525	$ (312,173,308)	$ 6,489,790

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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