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Statement of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Statement of Changes in Net Assets [Abstract]      
Opening balance (in Shares) 7,350,000 7,800,000 7,800,000
Creations (in Shares) 700,000   250,000
Redemptions (in Shares) (50,000)   (700,000)
Closing balance (in Shares) 8,000,000   7,350,000
Opening balance $ 761,731 $ 916,197 $ 916,197
Net investment loss (852) (907) (3,445)
Realized loss on investment in gold (2,770)   (3,504)
Change in unrealized gain / (loss) on investment in gold 129,424 $ (10,394) (101,529)
Change in unrealized gain / (loss) on unsettled creations or redemptions 44   (175)
Creations 82,925   30,185
Redemptions (5,951)   (75,998)
Closing balance $ 964,551   $ 761,731