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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Per Share Operating Performance:        
Net asset value, beginning of period $ 78.93 $ 66.47 $ 66.91 $ 70.05
Total income (loss) 0.86 (2.72) 13.02 (6.19)
Total expenses (0.16) (0.11) (0.30) (0.22)
Net increase (decrease) in net asset value 0.70 (2.83) 12.72 (6.41)
Net asset value, end of period $ 79.63 $ 63.64 $ 79.63 $ 63.64
Total Return 0.89% (4.26%) 19.01% (9.15%)
Ratios to Average Net Assets        
Total income (loss) 1.70% (2.02%) 19.33% (6.04%)
Management fees 0.45% 0.45% 0.45% 0.45%
Total expenses excluding management fees 0.37% 0.24% 0.37% 0.23%
Net income (loss) 1.50% (2.20%) 18.92% (6.38%)