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Australian Dollar Deposits - Additional Information (Detail)	9 Months Ended			12 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2025 AUD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 AUD ($)	Sep. 30, 2025 AUD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 AUD ($)
Cash and Cash Equivalents [Abstract]
Annual nominal rate	1.32%				1.32%
Principal deposits	$ 38,152,998	$ 59,388,396	$ 29,539,589	$ 54,439,364
Principal redemptions	32,008,424	$ 49,490,331	$ 39,066,378	$ 64,337,430
Deposits, interest bearing	$ 75,439,577				$ 113,827,760	$ 64,347,970	$ 103,929,695

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