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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 $ 79.63 $ 63.64 $ 66.91 $ 70.05
Total income (loss) (9.61) 17.24 3.41 11.05
Total expenses (0.16) (0.13) (0.46) (0.35)
Net increase (decrease) in net asset value (9.77) 17.11 2.95 10.70
Net asset value, end of period $ 69.86 $ 80.75 $ 69.86 $ 80.75
Total Return (12.27%) 26.89% 4.41% 15.27%
Ratios to Average Net Assets        
Total income (loss) (10.48%) 24.09% 9.94% 16.30%
Management fees 0.45% 0.45% 0.45% 0.45%
Total expenses excluding management fees 0.39% 0.25% 0.37% 0.24%
Net income (loss) (10.69%) 23.92% 9.32% 15.78%