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FINANCIAL HIGHLIGHTS (Tables) | 12 Months Ended
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Dec. 31, 2023
FINANCIAL HIGHLIGHTS |
Summary of per share performance data and other supplemental financial data | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Year ended |  | Year ended |  | Year ended | ​
​ | ​ | December 31, | ​ | December 31, | ​ | December 31, | ​
​ | ​ | 2023 | ​ | 2022 | ​ | 2021 | ​
Per Share Operating Performance: | ​ | ​ |  |  | ​ |  |  | ​ |  | ​
Net asset value, beginning of year | ​ | $ | 28.26 | ​ | $ | 20.87 | ​ | $ | 12.91 | ​
Total income (loss) | ​ |  | (0.61) | ​ |  | 7.68 | ​ |  | 8.14 | ​
Total expenses | ​ |  | (0.26) | ​ |  | (0.29) | ​ |  | (0.18) | ​
Net increase (decrease) in net asset value | ​ |  | (0.87) | ​ |  | 7.39 | ​ |  | 7.96 | ​
Net asset value, end of year | ​ | $ | 27.39 | ​ | $ | 28.26 | ​ | $ | 20.87 | ​
​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Total Return | ​ | ​ | (3.08) | % |  | 35.41 | % |  | 61.66 | %
​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Ratios to Average Net Assets | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Total income (loss) | ​ |  | (1.24) | % |  | 32.32 | % |  | 53.29 | %
Management fees | ​ |  | 0.75 | % |  | 0.75 | % |  | 0.75 | %
Total expenses excluding management fees | ​ |  | 0.19 | % |  | 0.25 | % |  | 0.34 | %
Expense waived | ​ |  | — | % |  | — | % |  | (0.07) | %
Net expense excluding management fees | ​ |  | 0.19 | % |  | 0.25 | % |  | 0.27 | %
Net income (loss) | ​ | ​ | (2.18) | % |  | 31.32 | % |  | 52.26 | %

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