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Derivative Instruments - Effect of Derivative Instruments on Statements of Income and Expenses (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Futures contracts, realized gain (loss) | $ 400,416 | $ 1,847,279 | $ 433,121 | $ 1,730,911
Futures contracts, unrealized gain (loss) | (15,790,205) | (575,543) | (14,774,223) | 23,639,108
Commodity Futures Contract [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Futures contracts, realized gain (loss) | 400,416 | 1,847,279 | 433,121 | 1,730,911
Futures contracts, unrealized gain (loss) | (15,790,205) | (575,543) | (14,774,223) | 23,639,108
Net realized and net change in unrealized gain (loss) | $ (15,389,789) | $ 1,271,736 | $ (14,341,102) | $ 25,370,019

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