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FINANCIAL HIGHLIGHTS (Tables) | 9 Months Ended
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Sep. 30, 2025
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, 2025 | ​ | September 30, 2024 | ​ | September 30, 2025 | ​ | September 30, 2024 |  | ​
​ | ​ | (Unaudited) |  | (Unaudited) |  | (Unaudited) |  | (Unaudited) |  | ​
Per Share Operating Performance: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​
Net asset value, beginning of period | ​ | $ | 29.24 | ​ | $ | 32.17 | ​ | $ | 30.14 |  | $ | 27.39 |  | ​
Total income (loss) | ​ |  | 0.84 | ​ | ​ | (3.81) | ​ | ​ | 0.11 |  |  | 1.15 |  | ​
Total expenses | ​ |  | (0.09) | ​ | ​ | (0.08) | ​ | ​ | (0.26) |  |  | (0.26) |  | ​
Net increase (decrease) in net asset value | ​ |  | 0.75 | ​ | ​ | (3.89) | ​ | ​ | (0.15) |  |  | 0.89 |  | ​
Net asset value, end of period | ​ | $ | 29.99 | ​ | $ | 28.28 | ​ | $ | 29.99 |  | $ | 28.28 |  | ​
​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  |  | ​ |  | ​
Total Return | ​ |  | 2.56 | % | ​ | (12.09) | % | ​ | (0.50) | % |  | 3.25 | % | ​
​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  |  | ​ |  | ​
Ratios to Average Net Assets | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  |  | ​ |  | ​
Total income (loss) | ​ |  | 2.82 | % | ​ | (12.36) | % | ​ | 2.30 | % |  | (0.26) | % | ​
Management fees# | ​ |  | 0.75 | % | ​ | 0.75 | % | ​ | 0.75 | % |  | 0.75 | % | ​
Total expenses excluding management fees# | ​ |  | 0.41 | % | ​ | 0.33 | % | ​ | 0.41 | % |  | 0.40 | % | ​
Net income (loss) | ​ |  | 2.53 | % | ​ | (12.63) | % | ​ | 1.44 | % |  | (1.12) | % | ​
# | Annualized.
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