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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Per Share Operating Performance:        
Net asset value, beginning of Period $ 40.54 $ 32.70 $ 35.23 $ 35.45
Total income (loss) (4.51) 7.44 0.97 4.81
Total expenses (0.12) (0.08) (0.29) (0.20)
Net increase (decrease) in net asset value (4.63) 7.36 0.68 4.61
Net asset value, end of Period $ 35.91 $ 40.06 $ 35.91 $ 40.06
Total Return (11.42%) 22.51% 1.93% 13.00%
Ratios to Average Net Assets        
Total income (loss) (11.79%) 20.38% 4.13% 13.18%
Management fees 0.60% 0.60% 0.60% 0.60%
Total expenses excluding management fees 0.63% 0.21% 0.40% 0.17%
Net income (loss) (12.10%) 20.17% 3.38% 12.61%