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Euro Deposits - Additional Information (Detail)	9 Months Ended			12 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2025 EUR (€)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 EUR (€)	Sep. 30, 2025 EUR (€)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 EUR (€)
Cash and Cash Equivalents [Abstract]
Annual nominal rate	1.10%				1.10%
Principal deposits	$ 494,656,678	€ 438,249,576	$ 80,476,324	€ 73,810,979
Principal redemptions	194,197,969	€ 170,686,675	$ 104,814,993	€ 110,717,094
Deposits, interest bearing	$ 504,104,617				€ 429,021,461	$ 167,191,705	€ 161,458,560

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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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