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Derivative Instruments - Effect of Derivative Instruments on Statements of Income and Expenses (Detail) - Currency Futures Contracts [Member] - Not Designated as Hedging Instrument [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Derivative Instruments Gain (Loss) [Line Items] |  |  |
Futures contracts, realized gain (loss) | $ 3,449,038 | $ (4,140,319) | $ (1,410,333)
Futures contracts, unrealized gain (loss) | 1,433,390 | (1,912,672) | 526,671
Future Contracts, Net Realized and Unrealized Gain (Loss) | $ 4,882,428 | $ (6,052,991) | $ (883,662)

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