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FINANCIAL HIGHLIGHTS (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Jun. 02, 2010
Per Unit Operating Performance:      
Net asset value, beginning of period $ 81.95 $ 74.54 $ 50.00
Total income (loss) $ 1.52 $ 11.96  
Total expenses $ (0.21) $ (0.20)  
Net increase in net asset value $ 1.31 $ 11.76  
Net asset value, end of period $ 83.26 $ 86.30 $ 50.00
Total Return 1.60% 15.78%  
Ratios to Average Net Assets      
Total income (loss) 1.81% 13.30%  
Management fees 0.75% [1] 0.75% [1]  
Total expenses excluding management fees 0.39% [1] 0.29% [1]  
Expenses waived (0.14%) [1] (0.06%) [1]  
Net expenses excluding management fees 0.25% [1] 0.23% [1]  
Net income (loss) 1.57% 13.05%  
[1] Annualized