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Balance Sheets (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Silver bullion inventory, fair value (in Dollars) $ 6,243,467 $ 9,710,962
Redeemable capital Shares, no par value (in Dollars per share)      
Redeemable capital Shares, issued 332,500,000 335,000,000
Redeemable capital Shares, outstanding 332,500,000 335,000,000