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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 $ 17.68 $ 9.98 $ 11.65 $ 7.74
Total income (loss) 4.39 4.53 10.51 6.80
Total expenses (0.05) (0.03) (0.14) (0.06)
Net increase (decrease) in net asset value 4.34 4.50 10.37 6.74
Net asset value, end of period $ 22.02 $ 14.48 $ 22.02 $ 14.48
Total Return 24.55% 45.09% 89.01% 87.08%
Ratios to Average Net Assets        
Total income (loss) 20.38% 39.27% 31.32% 72.32%
Management fees 0.75% 0.75% 0.75% 0.75%
Total expenses excluding management fees 0.82% 1.45% 0.67% 1.66%
Expense waived (0.67%) (1.30%) (0.52%) (1.51%)
Net expense excluding management fees 0.15% 0.15% 0.15% 0.15%
Net income (loss) 20.15% 39.04% 30.65% 71.65%