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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 $ 75.45 $ 66.91
Total income (loss) 2.06 12.17
Total expenses (0.16) (0.15)
Net increase (decrease) in net asset value 1.9 12.02
Net asset value, end of period $ 77.35 $ 78.93
Total Return 2.52% 17.96%
Ratios to Average Net Assets    
Total income (loss) 4.17% 17.15%
Management fees 0.45% 0.45%
Total expenses excluding management fees 0.39% 0.37%
Net income (loss) 3.97% 16.95%