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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 period $ 22.95 $ 17.82
Total income (loss) (10.75) 4.75
Total expenses (0.04) (0.05)
Net increase (decrease) in net asset value (10.79) 4.70
Net asset value, end of period $ 12.16 $ 22.52
Total Return (47.02%) 26.37%
Ratios to Average Net Assets    
Total income (loss) (54.66%) 22.55%
Management fees [1] 0.60% 0.60%
Expenses excluding management fees [1] 0.33% 0.31%
Net income (loss) (54.89%) 22.32%
[1] Annualized.