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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 0.60% [1]   0.60% [1]    
Sponsor Fees $ 262,117 $ 294,884 $ 850,197 $ 892,074  
Fees payable to Sponsor $ 80,025   $ 80,025   $ 116,992
[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.