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FINANCIAL HIGHLIGHTS (Tables) | 9 Months Ended
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Sep. 30, 2023
FINANCIAL HIGHLIGHTS |
Schedule of per share performance data and other supplemental financial data | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Three months ended |  | Nine months ended | ​ | Nine months ended | ​
​ | ​ | September 30, 2023 | ​ | September 30, 2022 |  | September 30, 2023 | ​ | September 30, 2022 | ​
​ |  | (Unaudited) |  | (Unaudited) |  | (Unaudited) |  | (Unaudited) | ​
Per Share Operating Performance: |  | ​ |  |  | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net asset value, beginning of period | ​ | $ | 11.51 | ​ | $ | 17.68 | ​ | $ | 17.24 | ​ | $ | 11.65 | ​
Total income (loss) | ​ |  | (0.61) | ​ |  | 4.39 | ​ | ​ | (6.29) | ​ | ​ | 10.51 | ​
Total expenses | ​ |  | (0.03) | ​ |  | (0.05) | ​ | ​ | (0.08) | ​ | ​ | (0.14) | ​
Net increase (decrease) in net asset value | ​ |  | (0.64) | ​ |  | 4.34 | ​ | ​ | (6.37) | ​ | ​ | 10.37 | ​
Net asset value, end of period | ​ | $ | 10.87 | ​ | $ | 22.02 | ​ | $ | 10.87 | ​ | $ | 22.02 | ​
​ | ​ |  | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total Return | ​ |  | (5.56) | % |  | 24.55 | % | ​ | (36.95) | % | ​ | 89.01 | %
​ | ​ |  | ​ | ​ |  |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ratios to Average Net Assets | ​ |  | ​ | ​ |  |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total income (loss) | ​ | ​ | (5.01) | % |  | 20.38 | % | ​ | (51.34) | % | ​ | 31.32 | %
Management fees# | ​ |  | 0.75 | % |  | 0.75 | % | ​ | 0.75 | % | ​ | 0.75 | %
Total expenses excluding management fees# | ​ |  | 1.24 | % |  | 0.82 | % | ​ | 1.01 | % | ​ | 0.67 | %
Expense waived# | ​ |  | (1.09) | % |  | (0.67) | % | ​ | (0.86) | % | ​ | (0.52) | %
Net expense excluding management fees# | ​ |  | 0.15 | % |  | 0.15 | % | ​ | 0.15 | % | ​ | 0.15 | %
Net income (loss) | ​ |  | (5.23) | % |  | 20.15 | % | ​ | (52.01) | % | ​ | 30.65 | %
# Annualized.

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