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Statements of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 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) 450,000   550,000
Redemptions (in Shares) 0   (500,000)
Closing balance (in Shares) 8,800,000   8,350,000
Opening balance $ 1,047,979 $ 934,952 $ 934,952
Net investment loss (1,061) (959) (3,997)
Realized gain on investment in gold 79   2,147
Change in unrealized gain on investment in gold 21,446 $ 69,391 108,712
Creations 58,226   67,119
Redemptions 0   (60,954)
Closing balance $ 1,126,669   $ 1,047,979