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Statement of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Statement of Changes in Net Assets [Abstract]      
Opening balance (in Shares) 18,300,000 18,700,000 18,700,000
Creations (in Shares) 300,000   1,000,000
Redemptions (in Shares) (200,000)   (1,400,000)
Closing balance (in Shares) 18,400,000   18,300,000
Opening balance $ 248,059 $ 293,797 $ 293,797
Net investment loss (198) (225) (854)
Realized loss on investment in silver (846)   (3,982)
Change in unrealized gain / (loss) on investment in silver 28,860 $ 14,111 (33,466)
Creations 4,494   15,497
Redemptions (3,008)   (22,933)
Closing balance $ 277,361   $ 248,059