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) | $ (484,985) | $ (69,654) |
| Futures contracts, unrealized gain (loss) | 2,737,737 | 5,846,871 |
| Commodity Futures Contract [Member] | Not Designated as Hedging Instrument [Member] | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Futures contracts, realized gain (loss) | (484,985) | (69,654) |
| Futures contracts, unrealized gain (loss) | 2,737,737 | 5,846,871 |
| Net Realized and Net Change in Unrealized Gain (Loss) | $ 2,252,752 | $ 5,777,217 |