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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 $ 30.14 $ 27.39
Total income (loss) 1.08 4.66
Total expenses (0.09) (0.09)
Net increase (decrease) in net asset value 0.99 4.57
Net asset value, end of period $ 31.13 $ 31.96
Total Return 3.28% 16.68%
Ratios to Average Net Assets    
Total income (loss) 5.22% 15.49%
Management fees 0.75% 0.75%
Total expenses excluding management fees 0.45% 0.45%
Net income (loss) 4.92% 15.20%