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Financial Highlights - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Per Share Performance (for a Share outstanding throughout the entire period)        
Net asset value per Share at beginning of year $ 116.15 $ 126.89 $ 117.46 $ 118.14
Income from investment operations:        
Net investment loss (0.11) (0.13) (0.23) (0.25)
Total realized and unrealized gains or losses on investment in gold (1.57) 2.29 (2.76) 11.16
Change in net assets from operations (1.68) 2.16 (2.99) 10.91
Net asset value per Share at end of year $ 114.47 $ 129.05 $ 114.47 $ 129.05
Weighted average number of shares 7,874,725 8,631,319 7,878,177 8,669,061
Expense Ratio        
Annualized Sponsor's Fee per Share 0.39% 0.39% 0.39% 0.39%
Net Investment Loss Ratio        
Net Investment Loss Ratio (0.39%) (0.39%) (0.39%) (0.39%)
Non-Annualized Total Return (1.45%) 1.70% (2.55%) 9.23%