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Condensed Statement of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Condensed Statement of Changes in Net Assets [Abstract]        
Opening balance (in Shares)   3,850,000 3,950,000 [1] 3,950,000 [1]
Creations (in Shares)   400,000   1,850,000 [1]
Redemptions (in Shares)   (1,750,000)   (1,950,000) [1]
Closing balance (in Shares) 2,500,000 2,500,000   3,850,000
Opening balance   $ 237,152 $ 259,804 [1] $ 259,804 [1]
Effect of adoption of new accounting principle (see Note 2.1) [1]       554
Net investment loss $ (212) (714) (850) (1,089) [1]
Realized gain on investment in Bullion   359   2,832 [1]
Change in unrealized loss on investment Bullion (7,421) (9,787) $ (6,380) (8,799) [1]
Creations   23,392   114,973 [1]
Redemptions   (111,755)   (131,123) [1]
Closing balance $ 138,647 $ 138,647   $ 237,152
[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.