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Statements of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Statements of Changes in Net Assets [Abstract]        
Opening balance (in Shares)   8,300,000 7,350,000 7,350,000
Creations (in Shares)   400,000   1,650,000
Redemptions (in Shares)   (300,000)   (700,000)
Closing balance (in Shares) 8,400,000 8,400,000   8,300,000
Opening balance   $ 934,952 $ 761,731 $ 761,731
Net investment loss $ (1,018) (2,964) (2,909) (3,924)
Realized gain (loss) on investment in gold   950   (5,714)
Change in unrealized gain on investment in gold 32,238 98,990 $ 197,351 59,660
Change in unrealized gain on unsettled creations or redemptions       44
Creations   48,709   202,685
Redemptions   (36,251)   (79,530)
Closing balance $ 1,044,386 $ 1,044,386   $ 934,952