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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Per Share Operating Performance:    
Net asset value, beginning of period $ 15.7 $ 12.22
Total income (loss) (1.17) 0.11
Net expenses (0.03) (0.02)
Net increase (decrease) in net asset value (1.2) 0.09
Net asset value, end of period $ 14.5 $ 12.31
Total Return (7.64%) 0.74%
Ratios to Average Net Assets    
Total income (loss) (7.73%) 6.92%
Management fees [1] 0.75% 0.75%
Total expenses excluding management fees [1] 0.60% 0.40%
Expenses waived [1] (0.45%) (0.25%)
Net expenses excluding management fees [1] 0.15% 0.15%
Net income (loss) (7.95%) 6.70%
[1] Annualized.