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Statements of Changes in Net Assets - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statements of Changes in Net Assets [Abstract]    
Opening balance (in Shares) 6,850,000 8,350,000
Creations (in Shares) 400,000 450,000
Redemptions (in Shares) (200,000)  
Closing balance (in Shares) 7,050,000 8,800,000
Opening balance $ 846,716 $ 1,047,979
Net investment loss (373) (1,061)
Realized gain on investment in gold 1,449 79
Change in unrealized gain on investment in gold 7,609 21,446
Creations 50,211 58,226
Redemptions (25,195)  
Closing balance $ 880,417 $ 1,126,669