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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 $ 32.68 $ 19.24 $ 20.87 $ 12.91
Total income (loss) (5.36) 1.47 6.60 7.88
Total expenses (0.08) (0.05) (0.23) (0.13)
Net increase (decrease) in net asset value (5.44) 1.42 6.37 7.75
Net asset value, end of period $ 27.24 $ 20.66 $ 27.24 $ 20.66
Total Return (16.65%) 7.38% 30.52% 60.03%
Ratios to Average Net Assets        
Total income (loss) (17.46%) 6.37% 30.26% 49.79%
Management fees 0.75% 0.75% 0.75% 0.75%
Total expenses excluding management fees 0.25% 0.33% 0.29% 0.34%
Expense waived       (0.08%)
Net expense excluding management fees 0.25% 0.33% 0.29% 0.26%
Net income (loss) (17.71%) 6.10% 29.48% 49.03%