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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Per Share Operating Performance:        
Net asset value, beginning of period $ 35.19 $ 40.54 $ 38.01 $ 35.23
Total income (loss) 0.41 (4.51) (2.23) 0.97
Total expenses (0.1) (0.12) (0.28) (0.29)
Net increase (decrease) in net asset value 0.31 (4.63) (2.51) 0.68
Net asset value, end of period $ 35.5 $ 35.91 $ 35.5 $ 35.91
Total Return 0.88% (11.42%) (6.60%) 1.93%
Ratios to Average Net Assets        
Total income (loss) 1.15% (11.79%) (6.64%) 4.13%
Management fees 0.60% 0.60% 0.60% 0.60%
Total expenses excluding management fees 0.53% 0.63% 0.42% 0.40%
Net income (loss) 0.87% (12.10%) (7.41%) 3.38%