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Financial Highlights - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Per Share Performance (for a Share outstanding throughout the entire period)        
Net asset value per Share at beginning of period $ 128.61 $ 114.47 $ 103.64 $ 117.46
Income from investment operations:        
Net investment loss (0.13) (0.11) (0.36) (0.34)
Total realized and unrealized gains or losses on investment in gold 0.17 (5.57) 25.37 (8.33)
Change in net assets from operations 0.04 (5.68) 25.01 (8.67)
Net asset value per Share at end of period $ 128.65 $ 108.79 $ 128.65 $ 108.79
Weighted average number of Shares 8,516,848 7,718,478 8,096,168 7,824,359
Expense ratio [1] 0.39% 0.39% 0.39% 0.39%
Net investment loss ratio [1] (0.39%) (0.39%) (0.39%) (0.39%)
Total return, at net asset value [2] 0.03% (4.96%) 24.13% (7.38%)
[1] Annualized for periods of less than one year.
[2] Total return is not annualized.