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Australian Dollar Deposits - Additional Information (Detail)	3 Months Ended			12 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2022 AUD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 AUD ($)	Mar. 31, 2022 AUD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 AUD ($)
Cash And Cash Equivalents [Abstract]
Annual nominal rate	0.00%				0.00%
Principal deposits	$ 3,583,297	$ 4,957,850	$ 11,566,005	$ 14,935,112
Principal redemptions	3,528,348	4,960,081	$ 7,715,269	84,490,117
Withdrawals (to pay expenses)		$ 138,969		$ 745,508
Deposits, interest bearing	$ 100,538,232				$ 133,881,737	$ 97,441,463	$ 134,022,937

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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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Total amount of cash paid for operating activities during the current period.

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