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Statements of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Statements of Changes in Net Assets [Abstract]      
Opening balance (in Shares) 4,500,000 3,100,000 3,100,000
Creations (in Shares) 450,000   1,850,000
Redemptions (in Shares) (50,000)   (450,000)
Closing balance (in Shares) 4,900,000   4,500,000
Opening balance $ 261,512 $ 161,766 $ 161,766
Net investment loss (431) (241) (1,284)
Realized gain (loss) on investment in Bullion 41   (2,716)
Change in unrealized gain on investment in Bullion 24,221 $ 23,340 9,000
Change in unrealized gain (loss) on unsettled creations or redemptions (58)   58
Creations 27,830   119,307
Redemptions (3,145)   (24,619)
Closing balance $ 309,970   $ 261,512