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Schedules of Investments (Unaudited) - Investments (Details)
Mar. 31, 2020
USD ($)
oz
Dec. 31, 2019
USD ($)
oz
Mar. 31, 2019
USD ($)
oz
Dec. 31, 2018
USD ($)
oz
Silver bullion (Ounce) | oz 395,368,466 362,616,711 309,301,232 317,233,610
Investment in silver bullion, cost $ 6,681,432,888 $ 6,294,157,046 $ 5,475,186,353 $ 5,641,558,156
Silver bullion fair value 5,507,482,733 6,543,418,555    
Less Liabilities (2,365,640) (2,659,990)    
Net Assets $ 5,505,117,093 $ 6,540,758,565 $ 4,668,431,637 $ 4,904,036,623