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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 before waiver 0.45% 0.45%  
Annualized rate of Sponsors Fee [1],[2] 0.30% 0.30%  
Sponsor's Fees $ 197,943 $ 224,585  
Sponsor fees waived 98,972 112,293  
Fees payable to Sponsor 69,899   $ 63,486
All other expenses $ 0 $ 0  
[1] Annualized for periods of less than one year.
[2] The Annualized Sponsor's Fee per Share is calculated net of the waiver (refer to Note 2.7). The Gross Annualized Sponsor's Fee per Share is 0.45%.(2) Annualized for periods of less than one year.