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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 $ 70.05 $ 54.18 $ 33.07
Total income (loss) (2.65) 16.31 21.48
Total expenses (0.49) (0.44) (0.37)
Net increase (decrease) in net asset value (3.14) 15.87 21.11
Net asset value, end of year $ 66.91 $ 70.05 $ 54.18
Total Return (4.48%) 29.29% 63.83%
Ratios to Average Net Assets      
Total income (loss) (2.20%) 31.22% 54.68%
Management fees 0.45% 0.45% 0.45%
Total expenses excluding management fees 0.25% 0.15% 0.36%
Net income (loss) (2.90%) 30.61% 53.87%