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Statement of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Statement of Changes in Net Assets [Abstract]        
Opening balance (in Shares)   7,350,000 7,800,000 7,800,000
Creations (in Shares)   1,400,000   250,000
Redemptions (in Shares)   (50,000)   (700,000)
Closing balance (in Shares) 8,700,000 8,700,000   7,350,000
Opening balance   $ 761,731 $ 916,197 $ 916,197
Net investment loss $ (1,074) (2,909) (2,633) (3,445)
Realized loss on investment in gold   (2,647)   (3,504)
Change in unrealized loss on investment in gold 771 197,351 $ (64,518) (101,529)
Change in unrealized loss on unsettled creations or redemptions   45   (175)
Creations   171,643   30,185
Redemptions   (5,951)   (75,998)
Closing balance $ 1,119,263 $ 1,119,263   $ 761,731