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Euro Deposits - Additional Information (Detail)	2 Months Ended	9 Months Ended
	Dec. 31, 2018 EUR (€)	Sep. 30, 2019 USD ($)	Sep. 30, 2019 EUR (€)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 EUR (€)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)
Cash And Cash Equivalents [Abstract]
Annual nominal rate		(0.40%)			(0.40%)
Principal deposits	€ 90,835,045	$ 192,248,072	€ 176,189,533	$ 453,816,851
Principal redemptions	33,462,989	270,071,178	219,334,306	$ 493,672,718
Withdrawals (to pay expenses)	€ 297,496		€ 1,301,938
Deposits, interest bearing		$ 253,882,760			€ 232,877,262	$ 317,022,841	€ 277,323,973

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- 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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