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Significant Accounting Policies (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Significant Accounting Policies [Abstract]          
Basket of shares     50,000    
Fair value transfers $ 0   $ 0   $ 0
Reserve for uncertain tax positions 0   $ 0   0
Annualized rate of Sponsors Fee     0.39%    
Sponsor Fees 983,042 $ 890,246 $ 1,834,899 $ 1,797,521  
Fees payable to Sponsor 338,794   338,794   $ 260,280
All other expenses $ 0 $ 0 $ 0 $ 0