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FINANCIAL HIGHLIGHTS (Tables) | 9 Months Ended
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Sep. 30, 2024
FINANCIAL HIGHLIGHTS |
Summary of per share performance data and other supplemental financial data | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Three months ended | ​ | Nine months ended |  | Nine months ended | ​
​ |  | September 30, 2024 |  | September 30, 2023 |  | September 30, 2024 | ​ | September 30, 2023 | ​
​ | ​ | (Unaudited) | ​ | (Unaudited) | ​ | (Unaudited) | ​ | (Unaudited) | ​
Per Share Operating Performance: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net asset value, beginning of period | ​ | $ | 32.17 | ​ | $ | 25.49 | ​ | $ | 27.39 | ​ | $ | 28.26 | ​
Total income (loss) | ​ |  | (3.81) | ​ |  | 6.64 | ​ | ​ | 1.15 | ​ |  | 3.99 | ​
Total expenses | ​ |  | (0.08) | ​ |  | (0.07) | ​ | ​ | (0.26) | ​ |  | (0.19) | ​
Net increase (decrease) in net asset value | ​ |  | (3.89) | ​ |  | 6.57 | ​ | ​ | 0.89 | ​ |  | 3.80 | ​
Net asset value, end of period | ​ | $ | 28.28 | ​ | $ | 32.06 | ​ | $ | 28.28 | ​ | $ | 32.06 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​
Total Return | ​ | ​ | (12.09) | % | ​ | 25.77 | % | ​ | 3.25 | % |  | 13.45 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​
Ratios to Average Net Assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​
Total income (loss) | ​ | ​ | (12.36) | % | ​ | 23.00 | % | ​ | (0.26) | % |  | 10.05 | %
Management fees# | ​ | ​ | 0.75 | % | ​ | 0.75 | % | ​ | 0.75 | % |  | 0.75 | %
Total expenses excluding management fees# | ​ | ​ | 0.33 | % | ​ | 0.20 | % | ​ | 0.40 | % |  | 0.16 | %
Net income (loss) | ​ | ​ | (12.63) | % | ​ | 22.76 | % | ​ | (1.12) | % |  | 9.37 | %
# | Annualized.
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