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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Per Share Operating Performance:    
Net asset value, beginning of year $ 20.91 $ 15.18
Total income (loss) (12.91) 4.08
Net expenses (0.03) (0.04)
Net increase (decrease) in net asset value (12.94) 4.04
Net asset value, end of year $ 7.97 $ 19.22
Total Return (61.88%) 26.61%
Ratios to Average Net Assets    
Total income (loss) (95.57%) 22.38%
Management fees 0.75% 0.75%
Total expenses excluding management fees 0.43% 0.18%
Expenses waived (0.28%) (0.03%)
Net expenses excluding management fees 0.15% 0.15%
Net income (loss) (95.80%) 22.16%