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FINANCIAL HIGHLIGHTS (Per Unit Performance Data and Other Supplemental Financial Data) (Details) (USD $)
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Nov. 18, 2009
Per Unit Operating Performance:      
Net asset value, beginning of period $ 18.32 $ 17.23 $ 50.00
Total income $ 1.33 $ 0.07  
Net expenses $ (0.09) $ (0.09)  
Net increase (decrease) in net asset value $ 1.24 $ (0.02)  
Net asset value, end of period $ 19.56 $ 17.21 $ 50.00
Total Return 6.77% (0.12%)  
Ratios to Average Net Assets      
Total income 10.27% 5.83%  
Management fees 0.75% [1] 0.75% [1]  
Total expenses excluding management fees 0.95% [1] 0.38% [1]  
Expenses waived (0.74%) [1] (0.17%) [1]  
Net expenses excluding management fees 0.21% [1] 0.21% [1]  
Net income 9.79% 5.35%  
[1] Annualized