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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Per Share Operating Performance:        
Net asset value, beginning of period $ 80.21 $ 49.87 $ 54.18 $ 33.07
Total income (loss) (14.95) 2.88 11.30 19.85
Total expenses (0.11) (0.10) (0.33) (0.27)
Net increase (decrease) in net asset value (15.06) 2.78 10.97 19.58
Net asset value, end of period $ 65.15 $ 52.65 $ 65.15 $ 52.65
Total Return (18.78%) 5.57% 20.25% 59.21%
Ratios to Average Net Assets        
Total income (loss) (19.26%) 5.06% 23.71% 49.45%
Management fees 0.45% 0.45% 0.45% 0.45%
Total expenses excluding management fees 0.17% 0.36% 0.14% 0.36%
Net income (loss) (19.41%) 4.86% 23.27% 48.84%