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Financial Highlights - $ / shares
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Per Share Performance (for a Share outstanding throughout the entire period)    
Net asset value per Share at beginning of year $ 52.18 $ 61.60
Income from investment operations:    
Net investment loss (0.08) (0.09)
Total realized and unrealized gains or losses on investment in Bullion 7.27 (0.41)
Change in net assets from operations 7.19 (0.50)
Net asset value per Share at end of year $ 59.37 $ 61.10
Weighted average number of Shares 2,848,901 3,007,222
Expense ratio [1] 0.60% 0.60%
Net investment loss ratio [1] (0.60%) (0.60%)
Total return, net asset value 13.78% (0.81%)
[1] Annualized for periods of less than one year.