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Significant Accounting Policies (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Bullion [Line Items]          
Basket of shares     50,000    
Fair value transfers $ 0   $ 0   $ 0
Bullion receivable 0   0   0
Bullion payable 0   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 $ 615,425 $ 499,629 $ 1,702,418 $ 1,619,440  
Fees payable to Sponsor 215,908   215,908   $ 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 1.50%   1.50%    
Palladium [Member]          
Bullion [Line Items]          
Percentage of assets help by Zurich Sub-Custodian 1.68%   1.68%    
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.