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Significant Accounting Policies (Narrative) (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Significant Accounting Policies [Abstract]          
Annualized rate of Sponsors Fee 0.39% [1]   0.39% [1]    
Sponsor Fees $ 1,049,835 $ 1,300,748 $ 3,189,347 $ 4,559,244  
Fees payable to Sponsor $ 329,484   $ 329,484   $ 350,601
[1] Effective January 1, 2014, the Trust has adopted the provisions of Topic 946, Investment Companies, and follows specialized accounting. Refer to Note 2.1 for additional information.