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Statements of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Statements of Changes in Net Assets [Abstract]        
Opening balance (in Shares)   8,350,000 8,300,000 8,300,000
Creations (in Shares)   800,000   550,000
Redemptions (in Shares)   (1,850,000)   (500,000)
Closing balance (in Shares) 7,300,000 7,300,000   8,350,000
Opening balance   $ 1,047,979 $ 934,952 $ 934,952
Net investment loss $ (1,062) (2,123) (1,946) (3,997)
Realized gain on investment in gold   11,637   2,147
Change in unrealized (loss) / gain on investment in gold (69,344) (47,898) $ 66,752 108,712
Creations   103,156   67,119
Redemptions   (230,807)   (60,954)
Closing balance $ 881,944 $ 881,944   $ 1,047,979