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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Per Share Operating Performance:      
Net asset value, beginning of period $ 66.91 $ 70.05 $ 54.18
Total income (loss) 9.15 (2.65) 16.31
Total expenses (0.61) (0.49) (0.44)
Net increase (decrease) in net asset value 8.54 (3.14) 15.87
Net asset value, end of period $ 75.45 $ 66.91 $ 70.05
Total Return 12.76% (4.48%) 29.29%
Ratios to Average Net Assets      
Total income (loss) 17.61% (2.20%) 31.22%
Management fees 0.45% 0.45% 0.45%
Total expenses excluding management fees 0.37% 0.25% 0.15%
Net income (loss) 16.79% (2.90%) 30.61%