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Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data
Sep. 30, 2011
Dec. 31, 2010
Balance Sheets [Abstract]  
Gold bullion inventory, fair value$ 8,528,070$ 5,317,017
Redeemable capital shares, par value$ 0$ 0
Redeemable capital shares, issued539,450,000386,950,000
Redeemable capital shares, outstanding539,450,000386,950,000