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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 $ 70.05 $ 54.18
Total income (loss) (3.47) 19.75
Total expenses (0.11) (0.10)
Net increase (decrease) in net asset value (3.58) 19.65
Net asset value, end of period $ 66.47 $ 73.83
Total Return (5.11%) 36.27%
Ratios to Average Net Assets    
Total income (loss) (3.95%) 28.67%
Management fees 0.45% 0.45%
Total expenses excluding management fees 0.23% 0.19%
Net income (loss) (4.12%) 28.52%