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FINANCIAL HIGHLIGHTS - Per share performance data and other supplemental financial data (Details) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Per Share Operating Performance:        
Net asset value, beginning of period $ 19.69 $ 9.61 $ 12.39 $ 9.20
Total income (loss) (1.18) 3.18 6.16 3.61
Total expenses (0.06) (0.04) (0.10) (0.06)
Net increase (decrease) in net asset value (1.24) 3.14 6.06 3.55
Net asset value, end of period $ 18.45 $ 12.75 $ 18.45 $ 12.75
Total Return (6.30%) 32.67% 48.91% 38.59%
Ratios to Average Net Assets        
Total income (loss) (10.84%) 29.45% 37.08% 34.79%
Management fees [1] 0.60% 0.60% 0.60% 0.60%
Total expenses excluding management fees [1] 0.41% 0.80% 0.41% 0.67%
Net income (loss) (11.09%) 29.10% 36.58% 34.16%
[1] #    Annualized.