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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Per Share Operating Performance:    
Net asset value, beginning of period $ 15.7 $ 12.22
Total income (loss) (0.41) 2.46
Net expenses (0.1) (0.09)
Net increase (decrease) in net asset value (0.51) 2.37
Net asset value, end of period $ 15.19 $ 14.59
Total Return (3.25%) 19.39%
Ratios to Average Net Assets    
Total income (loss) (1.30%) 25.74%
Management fees [1] 0.75% 0.75%
Total expenses excluding management fees [1] 0.48% 0.32%
Expenses waived [1] (0.33%) (0.17%)
Net expenses excluding management fees [1] 0.15% 0.15%
Net income (loss) (1.97%) 25.06%
[1] Annualized.