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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Per Share Operating Performance:      
Net asset value, beginning of year $ 28.26 $ 20.87 $ 12.91
Total income (loss) (0.61) 7.68 8.14
Total expenses (0.26) (0.29) (0.18)
Net increase (decrease) in net asset value (0.87) 7.39 7.96
Net asset value, end of year $ 27.39 $ 28.26 $ 20.87
Total Return (3.08%) 35.41% 61.66%
Ratios to Average Net Assets      
Total income (loss) (1.24%) 32.32% 53.29%
Management fees 0.75% 0.75% 0.75%
Total expenses excluding management fees 0.19% 0.25% 0.34%
Expense waived     (0.07%)
Net expense excluding management fees 0.19% 0.25% 0.27%
Net income (loss) (2.18%) 31.32% 52.26%