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FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation of Securities Using Fair Value Hierarchy (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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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 | 401,443,958 | 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 | $ 401,443,958 | $ 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 + Details
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