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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 $ 29.24 $ 32.17 $ 30.14 $ 27.39
Total income (loss) 0.84 (3.81) 0.11 1.15
Total expenses (0.09) (0.08) (0.26) (0.26)
Net increase (decrease) in net asset value 0.75 (3.89) (0.15) 0.89
Net asset value, end of period $ 29.99 $ 28.28 $ 29.99 $ 28.28
Total Return 2.56% (12.09%) (0.50%) 3.25%
Ratios to Average Net Assets        
Total income (loss) 2.82% (12.36%) 2.30% (0.26%)
Management fees 0.75% 0.75% 0.75% 0.75%
Total expenses excluding management fees 0.41% 0.33% 0.41% 0.40%
Net income (loss) 2.53% (12.63%) 1.44% (1.12%)