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Significant Accounting Policies (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Significant Accounting Policies [Abstract]          
Annualized rate of Sponsors Fee     0.60%    
Sponsor Fees $ 294,884 $ 281,679 $ 892,074 $ 857,339  
Fees payable to Sponsor $ 96,291   $ 96,291   $ 103,116