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Statement of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Statement of Changes in Net Assets [Abstract]      
Opening balance (in Shares) 8,300,000 7,350,000 7,350,000
Creations (in Shares) 150,000   1,650,000
Redemptions (in Shares) (50,000)   (700,000)
Closing balance (in Shares) 8,400,000   8,300,000
Opening balance $ 934,952 $ 761,731 $ 761,731
Net investment loss (959) (852) (3,924)
Realized gain (loss) on investment in gold 194   (5,714)
Change in unrealized gain on investment in gold 69,391 $ 129,424 59,660
Change in unrealized gain on unsettled creations or redemptions     44
Creations 17,764   202,685
Redemptions (6,103)   (79,530)
Closing balance $ 1,015,239   $ 934,952