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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Per Share Operating Performance:        
Net asset value, beginning of period $ 63.64 $ 80.21 $ 70.05 $ 54.18
Total income (loss) 17.24 (14.95) 11.05 11.30
Total expenses (0.13) (0.11) (0.35) (0.33)
Net increase (decrease) in net asset value 17.11 (15.06) 10.70 10.97
Net asset value, end of period $ 80.75 $ 65.15 $ 80.75 $ 65.15
Total Return 26.89% (18.78%) 15.27% 20.25%
Ratios to Average Net Assets        
Total income (loss) 24.09% (19.26%) 16.30% 23.71%
Management fees 0.45% 0.45% 0.45% 0.45%
Total expenses excluding management fees 0.25% 0.17% 0.24% 0.14%
Net income (loss) 23.92% (19.41%) 15.78% 23.27%