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Australian Dollar Deposits - Additional Information (Detail)	6 Months Ended			12 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2025 AUD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 AUD ($)	Jun. 30, 2025 AUD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 AUD ($)
Cash and Cash Equivalents [Abstract]
Annual nominal rate	1.52%				1.52%
Principal deposits	$ 34,906,162	$ 54,439,364	$ 13,048,072	$ 54,439,364
Principal redemptions	6,198,367	$ 9,898,066	$ 19,426,306	$ 64,337,430
Deposits, interest bearing	$ 97,300,604				$ 148,470,993	$ 64,347,970	$ 103,929,695

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