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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 $ 35.23 $ 35.45 $ 27.81
Total income (loss) 3.17 0.06 7.95
Total expenses (0.39) (0.28) (0.31)
Net increase (decrease) in net asset value 2.78 (0.22) 7.64
Net asset value, end of year $ 38.01 $ 35.23 $ 35.45
Total Return 7.89% (0.62%) 27.47%
Ratios to Average Net Assets      
Total income (loss) 9.39% 0.72% 31.17%
Management fees 0.60% 0.60% 0.60%
Total expenses excluding management fees 0.42% 0.19% 0.25%
Net income (loss) 8.36% (0.07%) 30.32%