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, realized gain (loss) | $ 32,706 | $ (116,368) |
| Futures contracts, unrealized gain (loss) | 1,015,982 | 24,214,651 |
| Commodity Futures Contract [Member] | Not Designated as Hedging Instrument [Member] | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Futures contracts, realized gain (loss) | 32,706 | (116,368) |
| Futures contracts, unrealized gain (loss) | 1,015,982 | 24,214,651 |
| Net realized and net change in unrealized gain (loss) | $ 1,048,688 | $ 24,098,283 |