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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Per Share Operating Performance:        
Net asset value, beginning of Period $ 39.99 $ 33.77 $ 35.23 $ 35.45
Total income (loss) 0.64 (1.01) 5.48 (2.63)
Total expenses (0.09) (0.06) (0.17) (0.12)
Net increase (decrease) in net asset value 0.55 (1.07) 5.31 (2.75)
Net asset value, end of Period $ 40.54 $ 32.70 $ 40.54 $ 32.70
Total Return 1.38% (3.17%) 15.07% (7.76%)
Ratios to Average Net Assets        
Total income (loss) 1.61% (2.45%) 14.59% (6.94%)
Management fees 0.60% 0.60% 0.60% 0.60%
Total expenses excluding management fees 0.31% 0.15% 0.30% 0.15%
Net income (loss) 1.39% (2.64%) 14.14% (7.31%)