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Significant Accounting Policies (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Significant Accounting Policies [Abstract]          
Fair value transfers $ 0   $ 0   $ 0
Reserve for uncertain tax positions $ 0   $ 0   0
Annualized rate of Sponsors Fee 0.39% 0.39% 0.39% 0.39%  
Sponsor Fees $ 835,812 $ 1,049,835 $ 2,633,333 $ 3,189,347  
Fees payable to Sponsor 268,802   268,802   $ 321,355
All other expenses $ 0 $ 0 $ 0 $ 0