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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Per Share Operating Performance:    
Net asset value, beginning of period $ 12.22 $ 22.39
Total income (loss) 2.46 (5.69)
Net expenses (0.09) (0.14)
Net increase (decrease) in net asset value 2.37 (5.83)
Net asset value, end of period $ 14.59 $ 16.56
Total Return 19.39% (26.04%)
Ratios to Average Net Assets    
Total income (loss) 25.74% (20.15%)
Management fees [1] 0.75% 0.75%
Total expenses excluding management fees [1] 0.32% 0.28%
Expenses waived [1] (0.17%) (0.13%)
Net expenses excluding management fees [1] 0.15% 0.15%
Net income (loss) 25.06% (20.82%)
[1] Annualized.