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FINANCIAL HIGHLIGHTS (Details) - $ / shares
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Per Share Operating Performance:    
Net asset value, beginning of period $ 38.01 $ 35.23
Total income (loss) 0.29 4.84
Total expenses (0.09) (0.08)
Net increase (decrease) in net asset value 0.2 4.76
Net asset value, end of period $ 38.21 $ 39.99
Total Return 0.53% 13.51%
Ratios to Average Net Assets    
Total income (loss) 0.96% 12.77%
Management fees 0.60% 0.60%
Total expenses excluding management fees 0.38% 0.30%
Net income (loss) 0.72% 12.55%