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Significant Accounting Policies (Narrative) (Details) - USD ($)		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Bullion [Line Items]
Basket of shares		50,000
Fair value transfers		$ 0		$ 0
Reserve for uncertain tax positions		$ 0		0
Annualized rate of Sponsors Fee	[1]	0.60%	0.60%
Sponsor Fees		$ 561,705	$ 430,339
Fees payable to Sponsor		193,099		$ 183,974
All other expenses		$ 0	$ 0
Silver [Member]
Bullion [Line Items]
Percentage of assets help by Zurich Sub-Custodian		0.00%
Platinum [Member]
Bullion [Line Items]
Percentage of assets help by Zurich Sub-Custodian		1.00%
Palladium [Member]
Bullion [Line Items]
Percentage of assets help by Zurich Sub-Custodian		2.00%
Gold [Member]
Bullion [Line Items]
Percentage of assets help by Zurich Sub-Custodian		0.00%
[1] Annualized for periods of less than one year.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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Fees paid to advisors who provide certain management support and administrative oversight services including the organization and sale of stock, investment funds, limited partnerships and mutual funds.

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