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Significant Accounting Policies (Narrative) (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Bullion [Line Items]
Basket of shares				50,000
Fair value transfers		$ 0		$ 0		$ 0
Bullion receivable		0		0
Bullion payable		0		0
Reserve for uncertain tax positions		$ 0		$ 0		0
Annualized rate of Sponsors Fee	[1]	0.60%	0.60%	0.60%	0.60%
Sponsor Fees		$ 499,629	$ 506,228	$ 1,619,440	$ 1,408,306
Fees payable to Sponsor		156,682		156,682		$ 183,974
All other expenses		$ 0	$ 0	$ 0	$ 0
Silver [Member]
Bullion [Line Items]
Percentage of assets help by Zurich Sub-Custodian		0.00%		0.00%
Platinum [Member]
Bullion [Line Items]
Percentage of assets help by Zurich Sub-Custodian		1.00%		1.00%
Palladium [Member]
Bullion [Line Items]
Percentage of assets help by Zurich Sub-Custodian		2.00%		2.00%
Gold [Member]
Bullion [Line Items]
Percentage of assets help by Zurich Sub-Custodian		0.00%		0.00%
[1] Annualized for periods of less than one year.

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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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