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FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation of Securities Using Fair Value Hierarchy (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
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Short-Term Investments |  |
Schedule of Trading Securities and Other Trading Assets |  |
Securities, fair value | $ 2,167,525,444 | $ 418,534,000
United States Contracts | Exchange-Traded Futures Contracts |  |
Schedule of Trading Securities and Other Trading Assets |  |
Securities, fair value | 353,430,717 | 401,443,958
Fair Value, Inputs, Level 1 | Short-Term Investments |  |
Schedule of Trading Securities and Other Trading Assets |  |
Securities, fair value | 2,167,525,444 | 418,534,000
Fair Value, Inputs, Level 1 | United States Contracts | Exchange-Traded Futures Contracts |  |
Schedule of Trading Securities and Other Trading Assets |  |
Securities, fair value | $ 353,430,717 | $ 401,443,958

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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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