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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 year $ 14.22  
Total income (loss) (7.19) $ 7.34
Total expenses (0.02) (0.04)
Net increase (decrease) in net asset value (7.21) 7.30
Net asset value, end of year $ 7.01 $ 19.69
Total Return (50.70%) 58.92%
Ratios to Average Net Assets    
Total income (loss) (50.21%) 58.44%
Management fees [1] 0.60% 0.60%
Total expenses excluding management fees [1] 0.55% 0.42%
Net income (loss) (50.49%) 58.19%
[1] #    Annualized.