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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Per Share Operating Performance:    
Net asset value, beginning of year $ 27.39 $ 28.26
Total income (loss) 4.66 (1.57)
Total expenses (0.09) (0.06)
Net increase (decrease) in net asset value 4.57 (1.63)
Net asset value, end of year $ 31.96 $ 26.63
Total Return 16.68% (5.77%)
Ratios to Average Net Assets    
Total income (loss) 15.49% (5.69%)
Management fees 0.75% 0.75%
Total expenses excluding management fees 0.45% 0.14%
Net income (loss) 15.20% (5.90%)