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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 $ 18.45 $ 12.75 $ 12.39 $ 9.20
Total income (loss) 4.90 7.58 11.06 11.19
Total expenses (0.07) (0.04) (0.17) (0.10)
Net increase (decrease) in net asset value 4.83 7.54 10.89 11.09
Net asset value, end of period $ 23.28 $ 20.29 $ 23.28 $ 20.29
Total Return 26.18% 59.14% 87.89% 120.54%
Ratios to Average Net Assets        
Total income (loss) 21.70% 47.64% 59.23% 80.90%
Management fees [1] 0.60% 0.60% 0.60% 0.60%
Total expenses excluding management fees [1] 0.47% 0.46% 0.43% 0.60%
Net income (loss) 21.43% 47.37% 58.45% 80.00%
[1] #    Annualized.