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Australian Dollar Deposits - Additional Information (Detail)	3 Months Ended			12 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2021 AUD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 AUD ($)	Mar. 31, 2021 AUD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 AUD ($)
Cash And Cash Equivalents [Abstract]
Annual nominal rate	0.00%				0.00%
Principal deposits	$ 11,566,005	$ 14,935,112		$ 114,776,341
Principal redemptions	7,715,269	9,956,467	$ 10,543,357	39,913,155
Withdrawals (to pay expenses)		$ 203,469		$ 529,228
Deposits, interest bearing	$ 159,259,970				$ 209,098,626	$ 157,666,229	$ 204,323,450

X

- Definition

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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- Definition

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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The cash outflow for reacquisition of callable preferred stock.

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