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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Per Share Operating Performance:    
Net asset value, beginning of year $ 54.18 $ 33.07
Total income (loss) 19.75 7.40
Total expenses (0.10) (0.07)
Net increase (decrease) in net asset value 19.65 7.33
Net asset value, end of year $ 73.83 $ 40.40
Total Return 36.27% 22.17%
Ratios to Average Net Assets    
Total income (loss) 28.67% 21.18%
Management fees 0.45% 0.45%
Total expenses excluding management fees 0.19% 0.31%
Net income (loss) 28.52% 20.99%