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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Per Share Operating Performance:        
Net asset value, beginning of period $ 66.47 $ 73.83 $ 70.05 $ 54.18
Total income (loss) (2.72) 6.49 (6.19) 26.24
Total expenses (0.11) (0.11) (0.22) (0.21)
Net increase (decrease) in net asset value (2.83) 6.38 (6.41) 26.03
Net asset value, end of period $ 63.64 $ 80.21 $ 63.64 $ 80.21
Total Return (4.26%) 8.64% (9.15%) 48.04%
Ratios to Average Net Assets        
Total income (loss) (2.02%) 8.48% (6.04%) 36.81%
Management fees 0.45% 0.45% 0.45% 0.45%
Total expenses excluding management fees 0.24% 0.09% 0.23% 0.14%
Net income (loss) (2.20%) 8.35% (6.38%) 36.52%