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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     $ 27.39 $ 28.26
Total income (loss) $ (3.81) $ 6.64 1.15 3.99
Total expenses (0.08) (0.07) (0.26) (0.19)
Net increase (decrease) in net asset value (3.89) 6.57 0.89 3.80
Net asset value, end of period $ 28.28 $ 32.06 $ 28.28 $ 32.06
Total Return (12.09%) 25.77% 3.25% 13.45%
Ratios to Average Net Assets        
Total income (loss) (12.36%) 23.00% (0.26%) 10.05%
Management fees 0.75% 0.75% 0.75% 0.75%
Total expenses excluding management fees 0.33% 0.20% 0.40% 0.16%
Net income (loss) (12.63%) 22.76% (1.12%) 9.37%