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FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation of BNO'S Securities (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Short-Term Investments	$ 220,847,000	$ 30,347,000
Exchange-Traded Futures Contracts
Foreign Contracts	6,209,650	2,196,530
Fair Value, Inputs, Level 1 [Member]
Short-Term Investments	220,847,000	30,347,000
Exchange-Traded Futures Contracts
Foreign Contracts	6,209,650	2,196,530
Fair Value, Inputs, Level 2 [Member]
Short-Term Investments	0	0
Exchange-Traded Futures Contracts
Foreign Contracts	0	0
Fair Value, Inputs, Level 3 [Member]
Short-Term Investments	0	0
Exchange-Traded Futures Contracts
Foreign Contracts	$ 0	$ 0

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Unrealized gain (loss) on open commodity futures contracts.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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