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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Per Share Operating Performance:        
Net asset value, beginning of period $ 31.13 $ 31.96 $ 30.14 $ 27.39
Total income (loss) (1.81) 0.3 (0.73) 4.96
Total expenses (0.08) (0.09) (0.17) (0.18)
Net increase (decrease) in net asset value (1.89) 0.21 (0.9) 4.78
Net asset value, end of period $ 29.24 $ 32.17 $ 29.24 $ 32.17
Total Return (6.07%) 0.66% (2.99%) 17.45%
Ratios to Average Net Assets        
Total income (loss) (6.87%) 0.79% (0.83%) 16.48%
Management fees 0.75% 0.75% 0.75% 0.75%
Total expenses excluding management fees 0.36% 0.44% 0.40% 0.45%
Net income (loss) (7.14%) 0.49% (1.40%) 15.88%