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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Per Share Operating Performance:        
Net asset value, beginning of year $ 17.91 $ 7.89 $ 11.65 $ 7.74
Total income (loss) (0.18) 2.11 6.11 2.28
Total expenses (0.05) (0.02) (0.08) (0.04)
Net increase (decrease) in net asset value (0.23) 2.09 6.03 2.24
Net asset value, end of year $ 17.68 $ 9.98 $ 17.68 $ 9.98
Total Return (1.28%) 26.49% 51.76% 28.94%
Ratios to Average Net Assets        
Total income (loss) (17.53%) 24.18% 8.45% 27.32%
Management fees 0.75% 0.75% 0.75% 0.75%
Total expenses excluding management fees 0.64% 1.90% 0.58% 1.81%
Expense waived (0.50%) (1.75%) (0.43%) (1.66%)
Net expense excluding management fees 0.14% 0.15% 0.15% 0.15%
Net income (loss) (17.75%) 23.96% 8.00% 26.87%