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FINANCIAL HIGHLIGHTS (Per Unit Performance Data and Other Supplemental Financial Data) (Details) (USD $)
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Nov. 18, 2009
Per Unit Operating Performance:      
Net asset value, beginning of period $ 18.32 $ 17.23 $ 50.00
Total loss $ (0.14) $ (0.19)  
Net expenses $ (0.14) $ (0.13)  
Net decrease in net asset value $ (0.28) $ (0.32)  
Net asset value, end of period $ 18.04 $ 16.91 $ 50.00
Total Return (1.53%) (1.86%)  
Ratios to Average Net Assets      
Total income 4.47% 5.56%  
Management fees 0.75% [1] 0.75% [1]  
Total expenses excluding management fees 0.99% [1] 0.45% [1]  
Expenses waived (0.80%) [1] (0.24%) [1]  
Net expenses excluding management fees 0.19% [1] 0.21% [1]  
Net income 3.76% 4.84%  
[1] Annualized