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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Per Share Operating Performance:    
Net asset value, beginning of period $ 27.81 $ 17.23
Total income (loss) 9.25 3.70
Total expenses (0.07) (0.04)
Net increase (decrease) in net asset value 9.18 3.66
Net asset value, end of period $ 36.99 $ 20.89
Total Return 33.01% 21.24%
Ratios to Average Net Assets    
Total income (loss) 28.35% 19.75%
Management fees [1] 0.60% 0.60%
Total expenses excluding management fees [1] 0.30% 0.25%
Net income (loss) 28.12% 19.54%
[1] Annualized.