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Statement of Changes in Net Assets - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Changes in Net Assets [Abstract]      
Opening balance (in Shares) 3,850,000 3,950,000  
Creations (in Shares) 1,000,000 1,850,000 2,050,000
Redemptions (in Shares) (1,750,000) (1,950,000) (300,000)
Closing balance (in Shares) 3,100,000 3,850,000 3,950,000
Opening balance [1] $ 237,152 $ 259,804  
Effect of adoption of new accounting principle (see Note 2.1) [1]   554  
Net investment loss (937) [1] (1,089) [1] $ (1,201) [2]
Realized gain on investment in Bullion [1] 336 2,832  
Change in unrealized loss on investment Bullion (18,186) [1] (8,799) [1] 0 [2]
Creations 55,156 [1] 114,973 [1] 149,235
Redemptions (111,755) [1] (131,123) [1] (20,607)
Closing balance [1] $ 161,766 $ 237,152 $ 259,804
[1] Effective January 1, 2014, the Trust has adopted the provisions of Topic 946. Refer to Note 2.1 for additional information.
[2] Represents audited amounts prior to the adoption of provisions for an investment company for accounting purposes. Refer to Note 2.1 for additional information.