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Financial Highlights - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value Disclosures [Abstract]      
Net asset value per Share at beginning of period $ 17.49 $ 15.03 $ 16.44
Income from investment operations:      
Net investment loss (0.06) (0.05) (0.05)
Total realized and unrealized gains or losses on investment in silver 8.16 2.51 (1.36)
Change in net assets from operations 8.10 2.46 (1.41)
Net asset value per Share at end of period $ 25.59 $ 17.49 $ 15.03
Weighted average number of Shares 29,257,514 22,988,630 21,487,534
Expense ratio [1] 0.30% 0.30% 0.30%
Net investment loss ratio (0.30%) (0.30%) (0.30%)
Total return, net asset value 46.31% 16.37% (8.58%)
[1] The expense ratio is calculated net of the voluntary waiver (refer to Note 2.7). The Gross Expense Ratio is 0.45%.