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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 $ 73.25 $ 79.63 $ 75.45 $ 66.91
Total income (loss) 0.49 (9.61) (1.4) 3.41
Total expenses (0.16) (0.16) (0.47) (0.46)
Net increase (decrease) in net asset value 0.33 (9.77) (1.87) 2.95
Net asset value, end of period $ 73.58 $ 69.86 $ 73.58 $ 69.86
Total Return 0.45% (12.27%) (2.48%) 4.41%
Ratios to Average Net Assets        
Total income (loss) 2.61% (10.48%) (0.29%) 9.94%
Management fees 0.45% 0.45% 0.45% 0.45%
Total expenses excluding management fees 0.40% 0.39% 0.40% 0.37%
Net income (loss) 2.40% (10.69%) (0.92%) 9.32%