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Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Statement of Financial Position [Abstract]    
Investment in silver at cost $ 966,910 $ 998,547
Common stock, shares authorized Unlimited Unlimited
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, shares issued 46,550,000 48,650,000
Common stock, shares outstanding 46,550,000 48,650,000
Net asset value per share (in dollars per share) $ 22.78 $ 23.00