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Significant Accounting Policies (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Significant Accounting Policies [Abstract]          
Annualized rate of Sponsors Fee     0.60%    
Sponsor Fees $ 282,344 $ 278,873 $ 597,190 $ 575,661  
Fees payable to Sponsor $ 81,155   $ 81,155   $ 103,116