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FINANCIAL HIGHLIGHTS (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 $ 36.99 $ 20.89 $ 27.81 $ 17.23
Total income (loss) 2.58 4.77 11.83 8.48
Total expenses (0.09) (0.05) (0.16) (0.10)
Net increase (decrease) in net asset value 2.49 4.72 11.67 8.38
Net asset value, end of period $ 39.48 $ 25.61 $ 39.48 $ 25.61
Total Return 6.73% 22.59% 41.96% 48.64%
Ratios to Average Net Assets        
Total income (loss) 6.58% 20.62% 35.44% 40.35%
Management fees [1] 0.60% 0.60% 0.60% 0.60%
Total expenses excluding management fees [1] 0.30% 0.34% 0.30% 0.30%
Net income (loss) 6.35% 20.38% 35.00% 39.90%
[1] Annualized.