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FINANCIAL INSTRUMENTS (Tables) | 12 Months Ended
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Dec. 31, 2021
FINANCIAL INSTRUMENTS |
Schedule of financial instrument measured at fair value for investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Level 1 | ​ | Level 2 | ​ | Level 3 | ​ | Total
​ | ​ | ​ | ​ | $ |  | $ |  | $ |  | $
Recurring measurements |  | Carrying amount |  | Fair value
Investments, at fair value |  |  | ​ |  |  |  |  |  |  |
December 31, 2021 |  | 31,942,458 | ​ | 28,078,556 | ​ | 3,363,902 | ​ | 500,000 | ​ | 31,942,458
December 31, 2020 |  | 21,089,997 | ​ | 17,132,629 | ​ | 3,957,368 | ​ | — | ​ | 21,089,997
Schedule of changes in fair value measurements of financial instruments classified as Level 3 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance at | ​ | ​ | ​ | Net Unrealized | ​ | Balance at
​ | ​ | January 1 | ​ | Additions | ​ | Gains/Losses | ​ | December 31
​ |  | $ |  | $ |  | $ |  | $
2021 | ​ | — | ​ | 500,000 | ​ | — | ​ | 500,000
2020 | ​ | — | ​ | — | ​ | — | ​ | —

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