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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
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)