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Statement of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Statement of Changes in Net Assets [Abstract]        
Opening balance (in Shares)   4,500,000 3,100,000 3,100,000
Creations (in Shares)   800,000   1,850,000
Redemptions (in Shares)   (50,000)   (450,000)
Closing balance (in Shares) 5,250,000 5,250,000   4,500,000
Opening balance   $ 261,512 $ 161,766 $ 161,766
Net investment loss $ (471) (902) (515) (1,284)
Realized gain (loss) on investment in Bullion   46   (2,716)
Change in unrealized gain on investment in Bullion (8,153) 16,068 $ 40,444 9,000
Change in unrealized gain (loss) on unsettled creations or redemptions   (87)   58
Creations   49,846   119,307
Redemptions   (3,145)   (24,619)
Closing balance $ 323,338 $ 323,338   $ 261,512