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FINANCIAL HIGHLIGHTS (Details) (USD $)
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 02, 2010
Per Unit Operating Performance:      
Net asset value, beginning of period $ 81.95 $ 74.54 $ 50.00
Total income (loss) $ (3.78) $ (4.78)  
Total expenses $ (0.40) $ (0.39)  
Net decrease in net asset value $ (4.18) $ (5.17)  
Net asset value, end of period $ 77.77 $ 69.37 $ 50.00
Total Return (5.10%) (6.94%)  
Ratios to Average Net Assets      
Total income (loss) (4.78%) (5.93%)  
Management fees 0.75% [1] 0.75% [1]  
Total expenses excluding management fees 0.38% [1] 0.30% [1]  
Expenses waived (0.13%) [1] (0.07%) [1]  
Net expenses excluding management fees 0.25% [1] 0.23% [1]  
Net income (loss) (5.27%) (6.42%)  
[1] Annualized