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Euro Deposits - Additional Information (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 EUR (€)
Cash And Cash Equivalents [Abstract] |  |  |  |  |  |
Annual nominal rate | (0.50%) |  |  |  | (0.50%) |
Principal deposits | $ 512,181,310 | € 428,947,584 | $ 276,072,032 | € 261,604,378 |  |
Principal redemptions | 475,189,145 | 414,936,856 | 338,189,726 | 281,022,381 |  |
Withdrawals (to pay expenses) |  | € 2,238,467 |  | € 1,798,500 |  |
Deposits, interest bearing | $ 327,516,510 |  | $ 287,480,505 |  | € 267,879,731 | € 256,107,470

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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118262064&loc=SL116631418-115840 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=118262064&loc=SL116631419-115840 + Details
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