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Statements of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Statements of Changes in Net Assets [Abstract]        
Opening balance (in Shares)   19,600,000 18,300,000 18,300,000
Creations (in Shares)   1,850,000   2,000,000
Redemptions (in Shares)   (600,000)   (700,000)
Closing balance (in Shares) 20,850,000 20,850,000   19,600,000
Opening balance   $ 311,267 $ 248,059 $ 248,059
Net investment loss $ (255) (511) (433) (957)
Realized loss on investment in silver   (969)   (2,101)
Change in unrealized (loss) / gain on investment in silver (31,284) 5,302 $ 83,259 42,412
Creations   30,469   35,054
Redemptions   (10,251)   (11,200)
Closing balance $ 335,307 $ 335,307   $ 311,267