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Euro Deposits - Additional Information (Detail)	3 Months Ended			12 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2022 EUR (€)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 EUR (€)	Mar. 31, 2022 EUR (€)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 EUR (€)
Cash And Cash Equivalents [Abstract]
Annual nominal rate	(0.65%)				(0.65%)
Principal deposits	$ 89,158,392	€ 78,911,190	$ 73,791,699	€ 154,383,268
Principal redemptions	108,633,073	97,472,712	$ 79,236,071	233,628,410
Withdrawals (to pay expenses)		€ 484,700		€ 2,525,944
Deposits, interest bearing	$ 185,881,017				€ 167,062,423	$ 211,643,424	€ 186,108,645

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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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The cash inflow from issuance of preferred stock that is classified as callable.

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