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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 $ 77.35 $ 78.93 $ 75.45 $ 66.91
Total income (loss) (3.95) 0.86 (1.89) 13.02
Total expenses (0.15) (0.16) (0.31) (0.3)
Net increase (decrease) in net asset value (4.1) 0.7 (2.2) 12.72
Net asset value, end of period $ 73.25 $ 79.63 $ 73.25 $ 79.63
Total Return (5.30%) 0.89% (2.92%) 19.01%
Ratios to Average Net Assets        
Total income (loss) (7.12%) 1.70% (2.83%) 19.33%
Management fees 0.45% 0.45% 0.45% 0.45%
Total expenses excluding management fees 0.41% 0.37% 0.40% 0.37%
Net income (loss) (7.33%) 1.50% (3.25%) 18.92%