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Fair Value Measurements (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of changes in fair value measurement, assets [abstract] |  |
Balance at beginning of year | $ 954,587,514 |
Realized losses on sales and redemptions for physical bullion | (5,400,608) | $ (966,565)
Change in unrealized gains (losses) | (76,160,284) | 57,726,059
Balance at end of year | 871,613,584 | 954,587,514
Recurring fair value measurement |  |
Reconciliation of changes in fair value measurement, assets [abstract] |  |
Balance at beginning of year | 954,587,514 | 885,981,474
Purchases | 7,501,519 | 13,450,769
Sales | (1,169,773) | (1,604,223)
Redemptions for physical bullion | (7,744,784) |
Realized losses on sales and redemptions for physical bullion | (5,400,608) | (966,565)
Change in unrealized gains (losses) | (76,160,284) | 57,726,059
Balance at end of year | $ 871,613,584 | $ 954,587,514

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- Definition The gains (losses) recognised in profit or loss for assets measured at fair value that are attributable to the change in unrealised gains or losses relating to those assets held at the end of the reporting period. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_f&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase in the fair value measurement of assets resulting from purchases of those assets. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_e_iii&doctype=Standard -URIDate 2018-03-16 + Details
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- References No definition available. + Details
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- Definition The decrease in the fair value measurement of assets resulting from sales. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_e_iii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of current silver bullion assets. + References No definition available. + Details
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- Definition Represents the net realized gains (losses) on redemptions/sales of bullion. + References No definition available. + Details
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- Definition The decrease in the fair value measurement of bullion holdings resulting from redemptions for physical bullion. + References No definition available. + Details
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- Details
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