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Statement of Changes in Net Assets - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Changes in Net Assets [Abstract]      
Opening balance (in Shares) 5,600,000 4,500,000 3,100,000
Creations (in Shares) 1,100,000 1,150,000 1,850,000
Redemptions (in Shares) (1,000,000) (50,000) (450,000)
Closing balance (in Shares) 5,700,000 5,600,000 4,500,000
Opening balance $ 361,932 $ 261,512 $ 161,766
Net investment loss (2,133) (1,943) (1,284)
Realized gain on investment in Bullion 128 68 (2,716)
Change in unrealized gain / (loss) on investment in Bullion (7,670) 33,120 9,000
Change in unrealized loss on unsettled creations or redemptions   (58) 58
Creations 69,065 72,378 119,307
Redemptions (62,058) (3,145) (24,619)
Closing balance $ 359,264 $ 361,932 $ 261,512