XML 29 R15.htm IDEA: XBRL DOCUMENT v2.4.0.6
Significant Accounting Policies (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Significant Accounting Policies [Abstract]      
Annualized rate of Sponsors Fee 0.60%    
Sponsor Fees $ 314,846 $ 296,788  
Fees payable to Sponsor $ 108,541   $ 103,116