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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Per Share Operating Performance:    
Net asset value, beginning of period $ 10.26 $ 9.26
Total income (loss) (1.10) 0.27
Net expenses (0.05) (0.04)
Net increase (decrease) in net asset value (1.15) 0.23
Net asset value, end of period $ 9.11 $ 9.49
Total Return (11.21%) 2.48%
Ratios to Average Net Assets    
Total income (loss) (10.48%) 3.03%
Management fees 0.75% 0.75%
Total expenses excluding management fees 1.96% 1.10%
Expenses waived (1.81%) (0.95%)
Net expenses excluding management fees 0.15% 0.15%
Net income (loss) (10.92%) 2.58%