Derivative Instruments - Effect of Derivative Instruments on Statements of Income and Expenses (Detail) - USD ($) |
3 Months Ended | |
|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Derivative Instruments Gain Loss [Line Items] | ||
| Futures contracts, net realized gain (loss) | $ (102,657) | $ (128,847) |
| Futures contracts, net unrealized gain (loss) | 1,233,168 | (3,463,382) |
| Commodity Futures Contract [Member] | Not Designated as Hedging Instrument [Member] | ||
| Derivative Instruments Gain Loss [Line Items] | ||
| Futures contracts, net realized gain (loss) | (102,657) | (128,847) |
| Futures contracts, net unrealized gain (loss) | 1,233,168 | (3,463,382) |
| Future contracts, net realized and unrealized gain (loss) | $ 1,130,511 | $ (3,592,229) |