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Significant Accounting Policies (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 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 $ 890,246 $ 1,086,360 $ 1,797,521 $ 2,139,512  
Fees payable to Sponsor 287,797   287,797   $ 321,355
All other expenses $ 0 $ 0 $ 0 $ 0