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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 [1] 0.60% 0.60% 0.60% 0.60%  
Sponsor Fees $ 273,879 $ 220,368 $ 515,081 $ 502,597  
Fees payable to Sponsor 98,205   98,205   $ 80,206
All other expenses $ 0 $ 0 $ 0 $ 0  
[1] Annualized for periods of less than one year.