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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Per Share Operating Performance:    
Net asset value, beginning of period $ 10.26 $ 9.26
Total income (loss) (1.35) 0.25
Net expenses (0.07) (0.06)
Net increase (decrease) in net asset value (1.42) 0.19
Net asset value, end of period $ 8.84 $ 9.45
Total Return (13.84%) 2.05%
Ratios to Average Net Assets    
Total income (loss) (13.48%) 2.89%
Management fees 0.75% 0.75%
Total expenses excluding management fees 1.89% 1.06%
Expenses waived (1.74%) (0.91%)
Net expenses excluding management fees 0.15% 0.15%
Net income (loss) (14.15%) 2.22%