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FINANCIAL HIGHLIGHTS (Tables) | 6 Months Ended
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Jun. 30, 2023
FINANCIAL HIGHLIGHTS |
Summary of per share performance data and other supplemental financial data | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Three months ended | ​ | Six months ended |  | Six months ended | ​
​ |  | June 30, 2023 |  | June 30, 2022 |  | June 30, 2023 | ​ | June 30, 2022 | ​
​ | ​ | (Unaudited) | ​ | (Unaudited) | ​ | (Unaudited) | ​ | (Unaudited) | ​
Per Share Operating Performance: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net asset value, beginning of period | ​ | $ | 26.63 | ​ | $ | 29.84 | ​ | $ | 28.26 | ​ | $ | 20.87 | ​
Total income (loss) | ​ |  | (1.08) | ​ |  | 2.92 | ​ | ​ | (2.65) | ​ |  | 11.96 | ​
Total expenses | ​ |  | (0.06) | ​ |  | (0.08) | ​ | ​ | (0.12) | ​ |  | (0.15) | ​
Net increase (decrease) in net asset value | ​ |  | (1.14) | ​ |  | 2.84 | ​ | ​ | (2.77) | ​ |  | 11.81 | ​
Net asset value, end of period | ​ | $ | 25.49 | ​ | $ | 32.68 | ​ | $ | 25.49 | ​ | $ | 32.68 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​
Total Return | ​ | ​ | (4.28) | % | ​ | 9.52 | % | ​ | (9.80) | % |  | 56.59 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​
Ratios to Average Net Assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​
Total income (loss) | ​ | ​ | (2.66) | % | ​ | 9.32 | % | ​ | (8.64) | % |  | 41.11 | %
Management fees# | ​ | ​ | 0.75 | % | ​ | 0.75 | % | ​ | 0.75 | % |  | 0.75 | %
Total expenses excluding management fees# | ​ | ​ | 0.15 | % | ​ | 0.30 | % | ​ | 0.14 | % |  | 0.31 | %
Net income (loss) | ​ | ​ | (2.89) | % | ​ | 9.06 | % | ​ | (9.08) | % |  | 40.59 | %
# | Annualized.
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