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Euro Deposits - Additional Information (Detail)	9 Months Ended			12 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2021 EUR (€)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 EUR (€)	Sep. 30, 2021 EUR (€)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)
Cash And Cash Equivalents [Abstract]
Annual nominal rate	(0.65%)				(0.65%)
Principal deposits	$ 157,363,731	€ 131,085,723	$ 334,139,542	€ 428,947,584
Principal redemptions	173,927,554	145,171,497	$ 270,204,291	414,936,856
Withdrawals (to pay expenses)		€ 1,894,599		€ 2,238,467
Deposits, interest bearing	$ 291,938,758				€ 251,899,358	$ 327,764,221	€ 267,879,731

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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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