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Significant Accounting Policies (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Significant Accounting Policies [Abstract]          
Annualized rate of sponsors fee     0.39%    
Sponsor fees $ 1,802,987 $ 1,611,203 $ 5,304,047 $ 4,064,361  
Fees payable to the Sponsor $ 630,197   $ 630,197   $ 560,620 [1]
[1] Derived from audited Statement of Financial Condition as of December 31, 2011.