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Significant Accounting Policies (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
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 before waiver 0.45% 0.45% 0.45% 0.45%  
Annualized rate of Sponsors Fee [1],[2] 0.30% 0.30% 0.30% 0.30%  
Sponsor's Fees $ 255,654 $ 235,091 $ 511,442 $ 433,034  
Sponsor fees waived 127,827 117,546 255,721 $ 216,517  
Fees payable to Sponsor 83,091   $ 83,091   $ 78,954
All other expenses $ 0 $ 0      
[1] Annualized for periods of less than one year.
[2] The Expense Ratio is calculated net of the voluntary waiver (refer to Note 2.7). The Gross Expense Ratio is 0.45%.