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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Per Share Operating Performance:    
Net asset value, beginning of year $ 11.65 $ 7.74
Total income (loss) 6.29 0.17
Total expenses (0.03) (0.02)
Net increase (decrease) in net asset value 6.26 0.15
Net asset value, end of year $ 17.91 $ 7.89
Total Return 53.73% 1.94%
Ratios to Average Net Assets    
Total income (loss) 41.83% 1.49%
Management fees 0.75% 0.75%
Total expenses excluding management fees 0.46% 1.70%
Expense waived (0.30%) (1.55%)
Net expense excluding management fees 0.16% 0.15%
Net income (loss) 41.61% 1.27%