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FINANCIAL HIGHLIGHTS (Tables) | 6 Months Ended
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Jun. 30, 2025
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, 2025 | ​ | June 30, 2024 | ​ | June 30, 2025 | ​ | June 30, 2024 |  | ​
​ | ​ | (Unaudited) |  | (Unaudited) |  | (Unaudited) |  | (Unaudited) |  | ​
Per Share Operating Performance: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​
Net asset value, beginning of period | ​ | $ | 31.13 | ​ | $ | 31.96 | ​ | $ | 30.14 |  | $ | 27.39 |  | ​
Total income (loss) | ​ |  | (1.81) | ​ | ​ | 0.30 | ​ | ​ | (0.73) |  |  | 4.96 |  | ​
Total expenses | ​ |  | (0.08) | ​ | ​ | (0.09) | ​ | ​ | (0.17) |  |  | (0.18) |  | ​
Net increase (decrease) in net asset value | ​ |  | (1.89) | ​ | ​ | 0.21 | ​ | ​ | (0.90) |  |  | 4.78 |  | ​
Net asset value, end of period | ​ | $ | 29.24 | ​ | $ | 32.17 | ​ | $ | 29.24 |  | $ | 32.17 |  | ​
​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  |  | ​ |  | ​
Total Return | ​ |  | (6.07) | % | ​ | 0.66 | % | ​ | (2.99) | % |  | 17.45 | % | ​
​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  |  | ​ |  | ​
Ratios to Average Net Assets | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  |  | ​ |  | ​
Total income (loss) | ​ |  | (6.87) | % | ​ | 0.79 | % | ​ | (0.83) | % |  | 16.48 | % | ​
Management fees# | ​ |  | 0.75 | % | ​ | 0.75 | % | ​ | 0.75 | % |  | 0.75 | % | ​
Total expenses excluding management fees# | ​ |  | 0.36 | % | ​ | 0.44 | % | ​ | 0.40 | % |  | 0.45 | % | ​
Net income (loss) | ​ |  | (7.14) | % | ​ | 0.49 | % | ​ | (1.40) | % |  | 15.88 | % | ​
# | Annualized.
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