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FINANCIAL HIGHLIGHTS (Tables) | 9 Months Ended
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Sep. 30, 2022
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, 2022 |  | September 30, 2021 |  | September 30, 2022 | ​ | September 30, 2021 | ​
​ | ​ | (Unaudited) | ​ | (Unaudited) | ​ | (Unaudited) | ​ | (Unaudited) | ​
Per Share Operating Performance: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net asset value, beginning of period | ​ | $ | 32.68 | ​ | $ | 19.24 | ​ | $ | 20.87 | ​ | $ | 12.91 | ​
Total income (loss) | ​ |  | (5.36) | ​ |  | 1.47 | ​ | ​ | 6.60 | ​ |  | 7.88 | ​
Total expenses | ​ |  | (0.08) | ​ |  | (0.05) | ​ | ​ | (0.23) | ​ |  | (0.13) | ​
Net increase (decrease) in net asset value | ​ |  | (5.44) | ​ |  | 1.42 | ​ | ​ | 6.37 | ​ |  | 7.75 | ​
Net asset value, end of period | ​ | $ | 27.24 | ​ | $ | 20.66 | ​ | $ | 27.24 | ​ | $ | 20.66 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​
Total Return | ​ | ​ | (16.65) | % | ​ | 7.38 | % | ​ | 30.52 | % |  | 60.03 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​
Ratios to Average Net Assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​
Total income (loss) | ​ | ​ | (17.46) | % | ​ | 6.37 | % | ​ | 30.26 | % |  | 49.79 | %
Management fees# | ​ | ​ | 0.75 | % | ​ | 0.75 | % | ​ | 0.75 | % |  | 0.75 | %
Total expenses excluding management fees# | ​ | ​ | 0.25 | % | ​ | 0.33 | % | ​ | 0.29 | % |  | 0.34 | %
Expense waived# | ​ | ​ | — | % | ​ | — | % | ​ | — | % |  | (0.08) | %
Net expense excluding management fees# | ​ | ​ | 0.25 | % | ​ | 0.33 | % | ​ | 0.29 | % |  | 0.26 | %
Net income (loss) | ​ | ​ | (17.71) | % | ​ | 6.10 | % | ​ | 29.48 | % |  | 49.03 | %
# | Annualized.
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