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Statement of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Statement of Changes in Net Assets [Abstract]        
Opening balance (in Shares)   5,600,000 4,500,000 4,500,000
Creations (in Shares)   650,000   1,150,000
Redemptions (in Shares)   (650,000)   (50,000)
Closing balance (in Shares) 5,600,000 5,600,000   5,600,000
Opening balance   $ 361,932 $ 261,512 $ 261,512
Net investment loss $ (558) (1,120) (902) (1,943)
Realized gain on investment in Bullion   1,324   68
Change in unrealized gain / (loss) on investment in Bullion (16,650) (19,145) $ 16,068 33,120
Change in unrealized loss on unsettled creations or redemptions       (58)
Creations   42,211   72,378
Redemptions   (41,576)   (3,145)
Closing balance $ 343,626 $ 343,626   $ 361,932