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Statement of Changes in Net Assets (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Opening balance at December 31, 2013 (in Shares) 3,950,000 [1]  
Creations (in Shares) 250,000 [1] 2,050,000
Redemptions (in Shares) (1,500,000) [1] (300,000)
Closing balance at March 31, 2014 (in Shares) 2,700,000 [1] 3,950,000 [1]
Opening balance at December 31, 2013 $ 259,804 [1],[2],[3]  
Net investment loss (311) [1]  
Realized gain on investment in Bullion 3,456 [1]  
Change in unrealized gain on investment Bullion 8,727 [1]  
Creations 17,776 [1] 149,235
Redemptions (102,078) [1] (20,607)
Closing balance at March 31, 2014 187,928 [1],[2] 259,804 [1],[2],[3]
Adjustments for Change to Fair Value [Member]
    
Closing balance at March 31, 2014 $ 554 [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] Authorized share capital is unlimited with no par value per Share. Shares issued and outstanding at March 31, 2014 were 2,700,000 and at December 31, 2013 were 3,950,000.
[3] Derived from audited Statement of Financial Condition as of December 31, 2013.