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Australian Dollar Deposits - Additional Information (Detail)	3 Months Ended			12 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2023 AUD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 AUD ($)	Mar. 31, 2023 AUD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 AUD ($)
Cash And Cash Equivalents [Abstract]
Annual nominal rate	1.22%				1.22%
Principal deposits	$ 3,410,985	$ 4,949,033	$ 3,583,297	$ 34,667,570
Principal redemptions	13,464,109	$ 9,898,066	$ 3,528,348	49,506,491
Withdrawals (to pay expenses)				$ 407,222
Deposits, interest bearing	$ 76,236,369				$ 113,827,761	$ 80,548,483	$ 118,776,794

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Rate of interest on investment.

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