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Significant Accounting Policies (Narrative) (Details) - USD ($)
1 Months Ended 11 Months Ended 12 Months Ended
Dec. 31, 2018
Nov. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Significant Accounting Policies [Abstract]          
Basket of shares     50,000    
Annualized rate of Sponsors Fee 0.17% 0.39%      
Reserve for uncertain tax positions $ 0   $ 0 $ 0  
Sponsor Fees     3,567,948 3,997,282 $ 3,924,259
Fees payable to Sponsor $ 119,052   $ 119,052 346,853  
All other expenses       $ 0 $ 0