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Sponsor's Fee (Details Textual) (USD $)
6 Months Ended
Apr. 30, 2013
Sponsor's Fee (Textual) [Abstract]  
Sponsor's fee accrues daily and paid monthly, annual nominal Rate 0.40%
Maximum [Member]
 
Sponsor's Fee (Textual) [Abstract]  
Legal fees and expenses assumed sponsor 100,000
Minimum [Member]
 
Sponsor's Fee (Textual) [Abstract]  
Legal fees and expenses not assumed by sponsor 100,000