XML 27 R25.htm IDEA: XBRL DOCUMENT v2.4.0.8
FINANCIAL HIGHLIGHTS (Per Unit Performance Data and Other Supplemental Financial Data) (Details) (USD $)
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Nov. 18, 2009
Per Unit Operating Performance:      
Net asset value, beginning of period $ 17.23 $ 21.21 $ 50.00
Total loss $ (0.19) $ (2.40)  
Total expenses $ (0.13) $ (0.13)  
Net decrease in net asset value $ (0.32) $ (2.53)  
Net asset value, end of period $ 16.91 $ 18.68 $ 50.00
Total Return (1.86%) (11.93%)  
Ratios to Average Net Assets      
Total income (loss) 5.56% (2.93%)  
Management fees 0.75% [1] 0.75% [1]  
Total expenses excluding management fees 0.45% [1] 0.39% [1]  
Expenses waived (0.24%) [1] (0.16%) [1]  
Net expenses excluding management fees 0.21% [1] 0.23% [1]  
Net income (loss) 4.84% (3.66%)  
[1] Annualized