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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 $ 26.63 $ 29.84 $ 28.26 $ 20.87
Total income (loss) (1.08) 2.92 (2.65) 11.96
Total expenses (0.06) (0.08) (0.12) (0.15)
Net increase (decrease) in net asset value (1.14) 2.84 (2.77) 11.81
Net asset value, end of period $ 25.49 $ 32.68 $ 25.49 $ 32.68
Total Return (4.28%) 9.52% (9.80%) 56.59%
Ratios to Average Net Assets        
Total income (loss) (2.66%) 9.32% (8.64%) 41.11%
Management fees 0.75% 0.75% 0.75% 0.75%
Total expenses excluding management fees 0.15% 0.30% 0.14% 0.31%
Net income (loss) (2.89%) 9.06% (9.08%) 40.59%