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FINANCIAL HIGHLIGHTS (Tables) | 12 Months Ended
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Dec. 31, 2023
FINANCIAL HIGHLIGHTS |
Schedule 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 | ​ | $ | 17.24 | ​ | $ | 11.65 | ​ | $ | 7.74 | ​
Total income (loss) | ​ |  | (8.56) | ​ |  | 5.78 | ​ |  | 4.01 | ​
Total expenses | ​ |  | (0.10) | ​ |  | (0.19) | ​ |  | (0.10) | ​
Net increase (decrease) in net asset value | ​ |  | (8.66) | ​ |  | 5.59 | ​ |  | 3.91 | ​
Net asset value, end of year | ​ | $ | 8.58 | ​ | $ | 17.24 | ​ | $ | 11.65 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total Return | ​ |  | (50.23) | % |  | 47.98 | % |  | 50.52 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ratios to Average Net Assets | ​ |  |  | ​ |  |  | ​ |  |  | ​
Total income (loss) | ​ |  | (75.12) | % |  | 11.13 | % |  | 28.53 | %
Management fees | ​ |  | 0.75 | % |  | 0.75 | % |  | 0.75 | %
Total expenses excluding management fees | ​ |  | 1.11 | % |  | 0.61 | % |  | 1.28 | %
Expense waived | ​ |  | (0.96) | % |  | (0.46) | % |  | (1.13) | %
Net expense excluding management fees | ​ |  | 0.15 | % |  | 0.15 | % |  | 0.15 | %
Net income (loss) | ​ |  | (76.02) | % |  | 10.23 | % |  | 27.63 | %

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