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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Per Share Operating Performance:    
Net asset value, beginning of period $ 17.23 $ 22.95
Total income (loss) 3.70 (10.75)
Total expenses (0.04) (0.04)
Net increase (decrease) in net asset value 3.66 (10.79)
Net asset value, end of period $ 20.89 $ 12.16
Total Return 21.24% (47.02%)
Ratios to Average Net Assets    
Total income (loss) 19.75% (54.66%)
Management fees [1] 0.60% 0.60%
Total expenses excluding management fees [1] 0.25% 0.33%
Net income (loss) 19.54% (54.89%)
[1] Annualized.