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Financial Highlights - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Per Share Performance (for a Share outstanding throughout the entire period)        
Net asset value per Share at beginning of period $ 17.65 $ 15.07 $ 15.88 $ 13.56
Income from investment operations:        
Net investment loss (0.01) (0.01) (0.03) (0.02)
Total realized and unrealized gains or losses on investment in silver (1.56) 2.92 0.23 4.44
Change in net assets from operations (1.57) 2.91 0.20 4.42
Net asset value per Share at end of period $ 16.08 $ 17.98 $ 16.08 $ 17.98
Weighted average number of Shares (in Shares) 20,643,956 18,685,714 20,391,713 18,457,692
Expense ratio [1],[2] 0.30% 0.30% 0.30% 0.30%
Net investment loss ratio [1] (0.30%) (0.30%) (0.30%) (0.30%)
Total return, at net asset value [3] (8.90%) 19.31% 1.26% 32.60%
[1] Annualized for periods of less than one year.
[2] The Expense Ratio is calculated net of the voluntary waiver (refer to Note 2.7). The Gross Expense Ratio is 0.45%.
[3] Total return is not annualized.