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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Per Share Operating Performance:        
Net asset value, beginning of period $ 9.98 $ 7.55 $ 7.74 $ 8.43
Total income (loss) 4.53 1.04 6.80 0.19
Total expenses (0.03) (0.02) (0.06) (0.05)
Net increase (decrease) in net asset value 4.50 1.02 6.74 0.14
Net asset value, end of period $ 14.48 $ 8.57 $ 14.48 $ 8.57
Total Return 45.09% 13.51% 87.08% 1.66%
Ratios to Average Net Assets        
Total income (loss) 39.27% 12.67% 72.32% 9.08%
Management fees 0.75% 0.75% 0.75% 0.75%
Total Expenses excluding management fees 1.45% 1.02% 1.66% 1.64%
Expense waived (1.30%) (0.90%) (1.51%) (1.49%)
Net expense excluding management fees 0.15% 0.12% 0.15% 0.15%
Net income (loss) 39.04% 12.45% 71.65% 8.40%