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Statements of Changes in Net Assets - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statements of Changes in Net Assets [Abstract]      
Opening balance (in Shares) 8,350,000 8,300,000 7,350,000
Creations (in Shares) 1,250,000 550,000 1,650,000
Redemptions (in Shares) (2,750,000) (500,000) (700,000)
Closing balance (in Shares) 6,850,000 8,350,000 8,300,000
Opening balance $ 1,047,979 $ 934,952 $ 761,731
Net investment loss (3,568) (3,997) (3,924)
Realized gain on investment in gold 10,846 2,147 (5,714)
Change in unrealized (loss) / gain on investment in gold (29,434) 108,712 59,660
Change in unrealized loss on unsettled creations or redemptions     44
Creations 157,503 67,119 202,685
Redemptions (336,610) (60,954) (79,530)
Closing balance $ 846,716 $ 1,047,979 $ 934,952