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Statements of Changes in Net Assets - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statements of Changes in Net Assets [Abstract]      
Opening balance (in Shares) 19,600,000 18,300,000 18,700,000
Creations (in Shares) 3,100,000 2,000,000 1,000,000
Redemptions (in Shares) (1,350,000) (700,000) (1,400,000)
Closing balance (in Shares) 21,350,000 19,600,000 18,300,000
Opening balance $ 311,267 $ 248,059 $ 293,797
Net investment loss (1,040) (957) (854)
Realized loss on investment in silver (2,596) (2,101) (3,982)
Change in unrealized gain / (loss) on investment in silver 15,856 42,412 (33,466)
Creations 50,050 35,054 15,497
Redemptions (22,486) (11,200) (22,933)
Closing balance $ 351,051 $ 311,267 $ 248,059