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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 $ 17.24 $ 11.65
Total income (loss) (5.55) 6.29
Total expenses (0.03) (0.03)
Net increase (decrease) in net asset value (5.58) 6.26
Net asset value, end of period $ 11.66 $ 17.91
Total Return (32.37%) 53.73%
Ratios to Average Net Assets    
Total income (loss) (44.62%) 41.83%
Management fees 0.75% 0.75%
Total expenses excluding management fees 0.84% 0.46%
Expense waived (0.69%) (0.30%)
Net expense excluding management fees 0.15% 0.16%
Net income (loss) (44.84%) 41.61%