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FINANCIAL HIGHLIGHTS (Tables) | 6 Months Ended
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Jun. 30, 2021
FINANCIAL HIGHLIGHTS |
Schedule of per share performance data and other supplemental financial data | The following table presents per share performance data and other supplemental financial data for the three and six months ended June 30, 2021 and 2020 for the shareholders. This information has been derived from information presented in the condensed financial statements. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Three months ended |  | Six months ended | ​ | Six months ended | ​ | ​
​ | ​ | June 30, 2021 | ​ | June 30, 2020 | ​ | June 30, 2021 | ​ | June 30, 2020 | ​ | ​
​ | ​ | (Unaudited) | ​ | (Unaudited) | ​ | (Unaudited) |  | (Unaudited) |  | ​
Per Share Operating Performance: | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Net asset value, beginning of period | ​ | $ | 15.84 | ​ | $ | 7.97 | ​ | $ | 12.91 | ​ | $ | 20.91 | ​ | ​
Total income (loss) | ​ |  | 3.45 | ​ | ​ | 2.82 | ​ |  | 6.41 | ​ | ​ | (10.10) | ​ | ​
Total expenses | ​ |  | (0.05) | ​ | ​ | (0.02) | ​ |  | (0.08) | ​ | ​ | (0.04) | ​ | ​
Net increase (decrease) in net asset value | ​ |  | 3.40 | ​ | ​ | 2.80 | ​ |  | 6.33 | ​ | ​ | (10.14) | ​ | ​
Net asset value, end of period | ​ | $ | 19.24 | ​ | $ | 10.77 | ​ | $ | 19.24 | ​ | $ | 10.77 | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​
Total Return | ​ | ​ | 21.46 | % | ​ | 35.13 | % |  | 49.03 | % | ​ | (48.49) | % | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​
Ratios to Average Net Assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​
Total income (loss) | ​ | ​ | 19.73 | % | ​ | 41.99 | % |  | 41.40 | % | ​ | 28.07 | % | ​
Management fees# | ​ | ​ | 0.75 | % | ​ | 0.75 | % |  | 0.75 | % | ​ | 0.75 | % | ​
Total expenses excluding management fees# | ​ | ​ | 0.39 | % | ​ | 0.43 | % |  | 0.34 | % | ​ | 0.43 | % | ​
Expense waived# | ​ | ​ | (0.08) | % | ​ | (0.27) | % |  | (0.12) | % | ​ | (0.27) | % | ​
Net expense excluding management fees# | ​ | ​ | 0.31 | % | ​ | 0.16 | % |  | 0.22 | % | ​ | 0.16 | % | ​
Net income (loss) | ​ | ​ | 19.47 | % | ​ | 41.77 | % |  | 40.92 | % | ​ | 27.62 | % | ​
# | Annualized.

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