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INVESTMENT IN EQUITY SECURITIES (Tables) | 6 Months Ended
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Jun. 30, 2020
Equity Method and Other Investments [Abstract] |
Schedule of investments in equity securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31, | ​
​ |  | 2020 |  | 2019 |
Equity Method Investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​
BTY | ​ | $ | 30,894 | ​ | $ | 119 | ​
Sonmol | ​ | ​ | 4,969 | ​ | ​ | — | ​
Kali Care | ​ | ​ | 3,691 | ​ | ​ | 3,881 | ​
Desotec GmbH | ​ | ​ | 845 | ​ | ​ | 858 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other Investments | ​ | ​ | 3,794 | ​ | ​ | 3,538 | ​
​ | ​ | $ | 44,193 | ​ | $ | 8,396 | ​

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