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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Per Share Operating Performance:        
Net asset value, beginning of period $ 20.89 $ 12.16 $ 17.23 $ 22.95
Total income (loss) 4.77 2.57 8.48 (8.19)
Total expenses (0.05) (0.03) (0.10) (0.06)
Net increase (decrease) in net asset value 4.72 2.54 8.38 (8.25)
Net asset value, end of period $ 25.61 $ 14.70 $ 25.61 $ 14.70
Total Return 22.59% 20.89% 48.64% (35.95%)
Ratios to Average Net Assets        
Total income (loss) 20.62% 43.12% 40.35% 53.68%
Management fees [1] 0.60% 0.60% 0.60% 0.60%
Total expenses excluding management fees [1] 0.34% 0.30% 0.30% 0.30%
Net income (loss) 20.38% 42.90% 39.90% 53.23%
[1] Annualized.