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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Per Share Operating Performance:    
Net asset value, beginning of period $ 15.7 $ 12.22
Total income (loss) (2.67) 2.7
Net expenses (0.06) (0.06)
Net increase (decrease) in net asset value (2.73) 2.64
Net asset value, end of period $ 12.97 $ 14.86
Total Return (17.39%) 21.60%
Ratios to Average Net Assets    
Total income (loss) (16.34%) 27.11%
Management fees [1] 0.75% 0.75%
Total expenses excluding management fees [1] 0.51% 0.32%
Expenses waived [1] (0.36%) (0.17%)
Net expenses excluding management fees [1] 0.15% 0.15%
Net income (loss) (16.79%) 26.67%
[1] Annualized.