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Financial Highlights (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Per Share Performance (for a Share outstanding throughout the entire period)    
Net asset value per Share at beginning of period $ 126.89 [1] $ 118.14 [2]
Income from investment operations:    
Net investment loss $ (0.13) [1] $ (0.25)
Net realized and unrealized gains and losses on investment in Bullion $ 2.29 [1] $ 11.16
Change in net assets from operations $ 2.16 [1] $ 10.91
Net asset value per Share at end of period $ 129.05 [1] $ 129.05 [1]
Weighted average number of shares 8,631,319 [1] 8,669,061 [1]
Expense Ratio    
Annualized Sponsor's fee per Share 0.39% [1] 0.39%
Net Investment Loss Ratio    
Annualized net investment loss ratio (0.39%) [1] (0.39%)
Non-Annualized Total Return 1.70% [1] 9.23%
[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.