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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Per Share Operating Performance:        
Net asset value, beginning of period $ 39.48 $ 25.61 $ 27.81 $ 17.23
Total income (loss) (6.95) 1.55 4.88 10.02
Total expenses (0.08) (0.06) (0.24) (0.15)
Net increase (decrease) in net asset value (7.03) 1.49 4.64 9.87
Net asset value, end of period $ 32.45 $ 27.10 $ 32.45 $ 27.10
Total Return (17.81%) 5.82% 16.68% 57.28%
Ratios to Average Net Assets        
Total income (loss) (18.84%) 4.62% 22.56% 47.37%
Management fees [1] 0.60% 0.60% 0.60% 0.60%
Total expenses excluding management fees [1] 0.23% 0.31% 0.28% 0.30%
Net income (loss) (19.05%) 4.39% 21.90% 46.70%
[1] Annualized.