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Statement of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 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)   700,000   1,150,000
Redemptions (in Shares)   (850,000)   (50,000)
Closing balance (in Shares) 5,450,000 5,450,000   5,600,000
Opening balance   $ 361,932 $ 261,512 $ 261,512
Net investment loss $ (500) (1,619) (1,408) (1,943)
Realized gain on investment in Bullion   417   68
Change in unrealized gain / (loss) on investment in Bullion (15,760) (34,906) $ 26,946 33,120
Change in unrealized loss on unsettled creations or redemptions       (58)
Creations   45,094   72,378
Redemptions   (53,065)   (3,145)
Closing balance $ 317,853 $ 317,853   $ 361,932