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Statement of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Statement of Changes in Net Assets [Abstract]        
Opening balance (in Shares)   3,100,000 3,850,000 3,850,000
Creations (in Shares)   1,450,000   1,000,000
Redemptions (in Shares)   (400,000)   (1,750,000)
Closing balance (in Shares) 4,150,000 4,150,000   3,100,000
Opening balance   $ 161,766 $ 237,152 $ 237,152
Net investment loss $ (380) (895) (714) (937)
Realized (loss) / gain on investment in Bullion   (2,724)   336
Change in unrealized loss on investment in Bullion 5,190 45,634 $ (9,787) (18,186)
Creations   95,725   55,156
Redemptions   (21,503)   (111,755)
Closing balance $ 278,003 $ 278,003   $ 161,766