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Statement of Changes in Net Assets - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Changes in Net Assets [Abstract]      
Opening balance (in Shares) 4,500,000 3,100,000 3,850,000
Creations (in Shares) 1,150,000 1,850,000 1,000,000
Redemptions (in Shares) (50,000) (450,000) (1,750,000)
Closing balance (in Shares) 5,600,000 4,500,000 3,100,000
Opening balance $ 261,512 $ 161,766 $ 237,152
Net investment loss (1,943) (1,284) (937)
Realized gain (loss) on investment in Bullion 68 (2,716) 336
Change in unrealized gain / (loss) on investment in Bullion 33,120 9,000 (18,186)
Change in unrealized (loss) / gain on unsettled creations or redemptions (58) 58  
Creations 72,378 119,307 55,156
Redemptions (3,145) (24,619) (111,755)
Closing balance $ 361,932 $ 261,512 $ 161,766