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FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation of Securities Using Fair Value Hierarchy (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Short-Term Investments
Schedule of Trading Securities and Other Trading Assets
Securities, fair value	$ 418,534,000	$ 1,175,542,347
United States Contracts | Exchange-Traded Futures Contracts
Schedule of Trading Securities and Other Trading Assets
Securities, fair value	96,694,260	37,520,567
Fair Value, Inputs, Level 1 | Short-Term Investments
Schedule of Trading Securities and Other Trading Assets
Securities, fair value	418,534,000	1,175,542,347
Fair Value, Inputs, Level 1 | United States Contracts | Exchange-Traded Futures Contracts
Schedule of Trading Securities and Other Trading Assets
Securities, fair value	$ 96,694,260	$ 37,520,567

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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