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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Per Share Operating Performance:        
Net asset value, beginning of period $ 7.63 $ 10.50 $ 8.43 $ 10.26
Total income (loss) (0.06) (1.32) (0.84) (1.10)
Total expenses (0.02) (0.07) (0.04) (0.05)
Net increase (decrease) in net asset value (0.08) (1.39) (0.88) (1.15)
Net asset value, end of period $ 7.55 $ 9.11 $ 7.55 $ 9.11
Total Return (1.05%) (13.24%) (10.44%) (11.21%)
Ratios to Average Net Assets        
Total income (loss) (2.25%) (13.80%) (11.90%) (10.48%)
Management fees 0.75% 0.75% 0.75% 0.75%
Total expenses excluding management fees 2.21% 2.05% 2.22% 1.96%
Expenses waived (2.01%) (0.45%) (2.04%) (1.81%)
Net expenses excluding management fees 0.20% 0.58% 0.18% 0.15%
Net income (loss) (2.49%) (14.02%) (12.36%) (10.92%)