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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Per Share Operating Performance:        
Net asset value, beginning of year $ 31.96 $ 26.63 $ 27.39 $ 28.26
Total income (loss) 0.30 (1.08) 4.96 (2.65)
Total expenses (0.09) (0.06) (0.18) (0.12)
Net increase (decrease) in net asset value 0.21 (1.14) 4.78 (2.77)
Net asset value, end of year $ 32.17 $ 25.49 $ 32.17 $ 25.49
Total Return 0.66% (4.28%) 17.45% (9.80%)
Ratios to Average Net Assets        
Total income (loss) 0.79% (2.66%) 16.48% (8.64%)
Management fees 0.75% 0.75% 0.75% 0.75%
Total expenses excluding management fees 0.44% 0.15% 0.45% 0.14%
Net income (loss) 0.49% (2.89%) 15.88% (9.08%)