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Statements of Financial Condition (Parenthetical) (USD $)
Jul. 31, 2012
Oct. 31, 2011
Statements of Financial Condition [Abstract]    
Redeemable Capital Shares, no par value      
Redeemable Capital Shares, shares authorized 26,500,000 26,500,000
Redeemable Capital Shares, shares issued 5,200,000 6,350,000
Redeemable Capital Shares, shares outstanding 5,200,000 6,350,000