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Statements of Assets and Liabilities (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Investment Company [Abstract]    
Investment in silver at cost $ 831,384 $ 608,877
Common stock, shares authorized Unlimited Unlimited
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, shares issued 41,700,000 33,750,000
Common stock, shares outstanding 41,700,000 33,750,000
Net asset value per share (in dollars per share) $ 24.86 $ 25.59