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FAIR VALUE OF FINANCIAL INSTRUMENTS - Effect of Derivative Instruments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Location of Gain (Loss) on Derivatives Recognized in Income	Change in unrealized gain (loss) on open positions
Realized Gain (Loss) on Derivatives Recognized in Income	$ 18,175,420	$ (4,153,140)	$ 12,264,400
Change in Unrealized Gain (Loss) on Derivatives Recognized in Income	$ 7,451,120	$ (11,877,420)	$ 3,255,030
Commodity Contract [Member]
Location of Gain (Loss) on Derivatives Recognized in Income	Realized gain (loss) on closed positions

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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- Definition

Description of where the net gain (loss) on foreign currency derivatives not designated as hedging instruments are reported in the statement of income or other statement of financial performance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(n)(7))
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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

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