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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Per Share Operating Performance:    
Net asset value, beginning of year $ 61.77 $ 62.94
Total income (loss) 41.85 1.5
Total expenses (0.18) (0.16)
Net increase (decrease) in net asset value 41.67 1.34
Net asset value, end of year $ 103.44 $ 64.28
Total Return 67.46% 2.13%
Ratios to Average Net Assets    
Total income (loss) 56.95% 2.43%
Management fees [1] 0.60% 0.60%
Total expenses excluding management fees [1] 0.35% 0.43%
Net income (loss) 56.72% 2.18%
[1] Annualized.