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Financial Highlights (USD $)
 3 Months Ended
Mar. 31, 2014
Per Share Performance (for a Share outstanding throughout the entire period)  
Net asset value per Share at beginning of period $ 118.14 [1],[2]
Income from investment operations:  
Net investment loss $ (0.12) [1]
Net realized and unrealized gains and losses on investment in Bullion $ 8.87 [1]
Change in net assets from operations $ 8.75 [1]
Net asset value per Share at end of period $ 126.89 [1]
Weighted Average Shares 8,707,222 [1]
Expense Ratio  
Annualized Sponsor's fee per Share 0.39% [1]
Net Investment Loss Ratio  
Annualized net investment loss ratio (0.39%) [1]
Non-Annualized Total Return 7.41% [1]
[1] Effective January 1, 2014, the Trust has adopted the provisions of Topic 946, Investment Companies, and follows specialized accounting. Refer to Note 2.1 for additional information.
[2] Derived from audited Statement of Financial Condition as of December 31, 2013.