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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Per Share Operating Performance:    
Net asset value, beginning of period $ 35.45 $ 27.81
Total income (loss) (1.62) 9.25
Total expenses (0.06) (0.07)
Net increase (decrease) in net asset value (1.68) 9.18
Net asset value, end of period $ 33.77 $ 36.99
Total Return (4.74%) 33.01%
Ratios to Average Net Assets    
Total income (loss) (4.45%) 28.35%
Management fees 0.60% 0.60%
Total expenses excluding management fees 0.14% 0.30%
Net income (loss) (4.63%) 28.12%