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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 year $ 27.39 $ 28.26 $ 20.87
Total income (loss) 3.09 (0.61) 7.68
Total expenses (0.34) (0.26) (0.29)
Net increase (decrease) in net asset value 2.75 (0.87) 7.39
Net asset value, end of year $ 30.14 $ 27.39 $ 28.26
Total Return 10.04% (3.08%) 35.41%
Ratios to Average Net Assets      
Total income (loss) 8.38% (1.24%) 32.32%
Management fees 0.75% 0.75% 0.75%
Total expenses excluding management fees 0.39% 0.19% 0.25%
Net income (loss) 7.23% (2.18%) 31.32%