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Condensed Statements of Financial Condition (Parentheticals) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Market value of investment in Silver (in Dollars) $ 483,177,486 $ 542,837,297 [1]
Common stock, shares authorized Unlimited Unlimited [1]
Common stock, shares issued 17,800,000 19,100,000 [1]
Common stock, shares outstanding 17,800,000 19,100,000 [1]
[1] Derived from audited Statement of Financial Condition as of December 31, 2011.