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Significant Accounting Policies (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Significant Accounting Policies [Abstract]      
Fair value transfers $ 0   $ 0
Reserve for uncertain tax positions $ 0   0
Annualized rate of Sponsors Fee 0.39%    
Sponsor Fees $ 851,857 $ 907,275  
Fees payable to Sponsor 317,685   $ 260,280
All other expenses $ 0 $ 0