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FINANCIAL HIGHLIGHTS (Tables) | 6 Months Ended
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Jun. 30, 2025
FINANCIAL HIGHLIGHTS |
Schedule 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 | ​ | $ | 38.21 | ​ | $ | 39.99 | ​ | $ | 38.01 | ​ | $ | 35.23 | ​
Total income (loss) | ​ |  | (2.94) | ​ |  | 0.64 | ​ |  | (2.65) | ​ |  | 5.48 | ​
Total expenses | ​ |  | (0.08) | ​ |  | (0.09) | ​ |  | (0.17) | ​ |  | (0.17) | ​
Net increase (decrease) in net asset value | ​ |  | (3.02) | ​ |  | 0.55 | ​ |  | (2.82) | ​ |  | 5.31 | ​
Net asset value, end of period | ​ | $ | 35.19 | ​ | $ | 40.54 | ​ | $ | 35.19 | ​ | $ | 40.54 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total Return | ​ |  | (7.90) | % |  | 1.38 | % |  | (7.42) | % |  | 15.07 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ratios to Average Net Assets | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​
Total income (loss) | ​ |  | (9.47) | % |  | 1.61 | % |  | (7.69) | % |  | 14.59 | %
Management fees# | ​ |  | 0.60 | % |  | 0.60 | % |  | 0.60 | % |  | 0.60 | %
Total expenses excluding management fees# | ​ |  | 0.36 | % |  | 0.31 | % |  | 0.37 | % |  | 0.30 | %
Net income (loss) | ​ |  | (9.71) | % |  | 1.39 | % |  | (8.17) | % |  | 14.14 | %
# | Annualized.

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- Definition Tabular disclosure of per unit performance data and other supplemental financial data. + References No definition available. + Details
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