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FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation of Securities Using Fair Value Hierarchy (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Trading Securities and Other Trading Assets |  |
transfers between Level I and Level II. | $ 0 | $ 0
transfers between Level II and Level I. | 0 | 0
Short-Term Investments |  |
Schedule of Trading Securities and Other Trading Assets |  |
Securities, fair value | 1,175,542,347 | 1,334,416,220
United States Contracts | Exchange-Traded Futures Contracts |  |
Schedule of Trading Securities and Other Trading Assets |  |
Securities, fair value | 37,520,567 | (194,392,958)
Fair Value, Inputs, Level 1 | Short-Term Investments |  |
Schedule of Trading Securities and Other Trading Assets |  |
Securities, fair value | 1,175,542,347 | 1,334,416,220
Fair Value, Inputs, Level 1 | United States Contracts | Exchange-Traded Futures Contracts |  |
Schedule of Trading Securities and Other Trading Assets |  |
Securities, fair value | 37,520,567 | (194,392,958)
Fair Value, Inputs, Level 2 | Short-Term Investments |  |
Schedule of Trading Securities and Other Trading Assets |  |
Securities, fair value | 0 | 0
Fair Value, Inputs, Level 2 | United States Contracts | Exchange-Traded Futures Contracts |  |
Schedule of Trading Securities and Other Trading Assets |  |
Securities, fair value | 0 | 0
Fair Value, Inputs, Level 3 | Short-Term Investments |  |
Schedule of Trading Securities and Other Trading Assets |  |
Securities, fair value | 0 | 0
Fair Value, Inputs, Level 3 | United States Contracts | Exchange-Traded Futures Contracts |  |
Schedule of Trading Securities and Other Trading Assets |  |
Securities, fair value | $ 0 | $ 0

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- Definition Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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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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