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FINANCIAL HIGHLIGHTS (Tables) | 9 Months Ended
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Sep. 30, 2023
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, 2023 |  | September 30, 2022 |  | September 30, 2023 | ​ | September 30, 2022 | ​
​ | ​ | (Unaudited) | ​ | (Unaudited) | ​ | (Unaudited) | ​ | (Unaudited) | ​
Per Share Operating Performance: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net asset value, beginning of period | ​ | $ | 25.49 | ​ | $ | 32.68 | ​ | $ | 28.26 | ​ | $ | 20.87 | ​
Total income (loss) | ​ |  | 6.64 | ​ |  | (5.36) | ​ | ​ | 3.99 | ​ |  | 6.60 | ​
Total expenses | ​ |  | (0.07) | ​ |  | (0.08) | ​ | ​ | (0.19) | ​ |  | (0.23) | ​
Net increase (decrease) in net asset value | ​ |  | 6.57 | ​ |  | (5.44) | ​ | ​ | 3.80 | ​ |  | 6.37 | ​
Net asset value, end of period | ​ | $ | 32.06 | ​ | $ | 27.24 | ​ | $ | 32.06 | ​ | $ | 27.24 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​
Total Return | ​ | ​ | 25.77 | % | ​ | (16.65) | % | ​ | 13.45 | % |  | 30.52 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​
Ratios to Average Net Assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​
Total income (loss) | ​ | ​ | 23.00 | % | ​ | (17.46) | % | ​ | 10.05 | % |  | 30.26 | %
Management fees# | ​ | ​ | 0.75 | % | ​ | 0.75 | % | ​ | 0.75 | % |  | 0.75 | %
Total expenses excluding management fees# | ​ | ​ | 0.20 | % | ​ | 0.25 | % | ​ | 0.16 | % |  | 0.29 | %
Net income (loss) | ​ | ​ | 22.76 | % | ​ | (17.71) | % | ​ | 9.37 | % |  | 29.48 | %
# | Annualized.
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