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Statements of Assets and Liabilities (Unaudited) (Parentheticals) - USD ($)
$ / shares in Thousands
Sep. 30, 2018
Dec. 31, 2017
Investment in silver bullion, cost $ 5,939,485,807 $ 5,831,748,196
Shares, par value (in dollars per share) $ 0 $ 0
Shares issued (in shares) 354,250,000 339,750,000