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FINANCIAL HIGHLIGHTS - Per share performance data and other supplemental financial data (Details) - $ / shares
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Per Share Operating Performance:    
Net asset value, beginning of year $ 12.39 $ 9.20
Total income (loss) 7.34 0.44
Total expenses (0.04) (0.03)
Net increase (decrease) in net asset value 7.30 0.41
Net asset value, end of period $ 19.69 $ 9.61
Total Return 58.92% 4.46%
Ratios to Average Net Assets    
Total income (loss) 58.44% 8.46%
Management fees [1] 0.60% 0.60%
Total expenses excluding management fees [1] 0.42% 0.57%
Net income (loss) 58.19% 8.18%
[1] #    Annualized.