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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Per Share Operating Performance:    
Net asset value, beginning of period $ 22.39 $ 43.81
Total income (loss) (5.69) (5.79)
Net expenses (0.14) (0.30)
Net increase (decrease) in net asset value (5.83) (6.09)
Net asset value, end of period $ 16.56 $ 37.72
Total Return (26.04%) (13.90%)
Ratios to Average Net Assets    
Total income (loss) (20.15%) (18.50%)
Management fees [1] 0.75% 0.75%
Total expenses excluding management fees [1] 0.28% 0.51%
Expenses waived [1] (0.13%) (0.33%)
Net expenses excluding management fees [1] 0.15% 0.18%
Net income (loss) (20.82%) (19.20%)
[1] Annualized.