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Statements of Changes in Net Assets - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]      
Opening balance (in shares) 23,300,000 22,600,000 21,350,000
Opening balance $ 407,464 $ 339,734 $ 351,051
Net investment loss (1,787) (1,087) (985)
Realized gain (loss) on investment in silver 4,920 (2,399) (4,553)
Change in unrealized gain (loss) on investment in silver 258,079 59,907 $ (22,626)
Change in unrealized (loss) on unsettled creations or redemptions $ (84) $ 84  
Creations (in shares) 11,500,000 2,250,000 3,000,000
Creations $ 218,306 $ 36,430 $ 44,194
Redemptions (in shares) (1,050,000) (1,550,000) (1,750,000)
Redemptions $ (23,234) $ (25,205) $ (27,347)
Closing balance (in Shares) 33,750,000 23,300,000 22,600,000
Closing balance $ 863,664 $ 407,464 $ 339,734