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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 $ 11.66 $ 17.91 $ 17.24 $ 11.65
Total income (loss) (0.13) (0.18) (5.68) 6.11
Total expenses (0.02) (0.05) (0.05) (0.08)
Net increase (decrease) in net asset value (0.15) (0.23) (5.73) 6.03
Net asset value, end of period $ 11.51 $ 17.68 $ 11.51 $ 17.68
Total Return (1.29%) (1.28%) (33.24%) 51.76%
Ratios to Average Net Assets        
Total income (loss) (0.89%) (17.53%) (47.35%) 8.45%
Management fees 0.75% 0.75% 0.75% 0.75%
Total expenses excluding management fees 0.92% 0.64% 0.88% 0.58%
Expense waived (0.77%) (0.50%) (0.73%) (0.43%)
Net expense excluding management fees 0.15% 0.14% 0.15% 0.15%
Net income (loss) (1.11%) (17.75%) (47.80%) 8.00%