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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2018
Per Share Operating Performance:        
Net asset value, beginning of period $ 20.87 $ 12.91 $ 20.91  
Total income (loss) 7.68 8.14 (7.90)  
Total expenses (0.29) (0.18) (0.10)  
Net increase (decrease) in net asset value 7.39 7.96 (8.00)  
Net asset value, end of period $ 28.26 $ 20.87 $ 12.91  
Total Return 35.41% 61.66% (38.26%)  
Ratios to Average Net Assets        
Total income (loss) 32.32% 53.29% 42.40%  
Management fees 0.75% 0.75% 0.75%  
Total expenses excluding management fees 0.25%   0.34% 0.38%
Expense waived   (0.07%) (0.23%)  
Net expense excluding management fees 0.25% 0.27% 0.15%  
Net income (loss) 31.32% 52.26% 41.50%