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Significant Accounting Policies (Narrative) (Details) - USD ($)		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Bullion [Line Items]
Basket of shares		50,000
Fair value transfers		$ 0		$ 0
Bullion receivable		0		7,619,507
Bullion payable		0		0
Reserve for uncertain tax positions		$ 0		0
Annualized rate of Sponsors Fee	[1]	0.60%	0.60%
Sponsor Fees		$ 795,664	$ 539,776
Fees payable to Sponsor		270,643		$ 248,496
Maximum sponsorfee for administrative and marketing expenses		100,000
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		1.48%
Palladium [Member]
Bullion [Line Items]
Percentage of assets help by Zurich Sub-Custodian		1.32%
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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