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Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Statements of Assets and Liabilities [Abstract]    
Investment in silver at cost $ 347,191 $ 346,742
Common stock, shares authorized unlimited unlimited
Common stock, par value $ 0 $ 0
Common stock, shares issued 18,400,000 18,300,000
Common stock, shares outstanding 18,400,000 18,300,000
Net asset value per share $ 15.07 $ 13.56