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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 $ 25.49 $ 32.68 $ 28.26 $ 20.87
Total income (loss) 6.64 (5.36) 3.99 6.60
Total expenses (0.07) (0.08) (0.19) (0.23)
Net increase (decrease) in net asset value 6.57 (5.44) 3.80 6.37
Net asset value, end of period $ 32.06 $ 27.24 $ 32.06 $ 27.24
Total Return 25.77% (16.65%) 13.45% 30.52%
Ratios to Average Net Assets        
Total income (loss) 23.00% (17.46%) 10.05% 30.26%
Management fees 0.75% 0.75% 0.75% 0.75%
Total expenses excluding management fees 0.20% 0.25% 0.16% 0.29%
Net income (loss) 22.76% (17.71%) 9.37% 29.48%