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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Per Share Operating Performance:        
Net asset value, beginning of period $ 11.51 $ 17.68 $ 17.24 $ 11.65
Total income (loss) (0.61) 4.39 (6.29) 10.51
Total expenses (0.03) (0.05) (0.08) (0.14)
Net increase (decrease) in net asset value (0.64) 4.34 (6.37) 10.37
Net asset value, end of period $ 10.87 $ 22.02 $ 10.87 $ 22.02
Total Return (5.56%) 24.55% (36.95%) 89.01%
Ratios to Average Net Assets        
Total income (loss) (5.01%) 20.38% (51.34%) 31.32%
Management fees 0.75% 0.75% 0.75% 0.75%
Total expenses excluding management fees 1.24% 0.82% 1.01% 0.67%
Expense waived (1.09%) (0.67%) (0.86%) (0.52%)
Net expense excluding management fees 0.15% 0.15% 0.15% 0.15%
Net income (loss) (5.23%) 20.15% (52.01%) 30.65%