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Canadian Dollar Deposits - Additional Information (Detail)	9 Months Ended			12 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2025 CAD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 CAD ($)	Sep. 30, 2025 CAD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 CAD ($)
Cash and Cash Equivalents [Abstract]
Principal deposits	$ 38,332,111	$ 53,752,970	$ 21,469,947	$ 34,206,434
Principal redemptions	10,343,894	$ 14,659,900	$ 36,155,840	$ 48,866,326
Deposits, interest bearing	$ 91,312,662				$ 127,052,438	$ 61,159,344	$ 87,959,368
Annual nominal rate	0.71%				0.71%

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