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OTHER ACCRUED LIABILITIES (Tables) | 6 Months Ended
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Jun. 30, 2021
OTHER ACCRUED LIABILITIES |
Schedule of other accrued liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, 2021 |  | December 31, 2020
Prepayments from customers | ​ | $ | 2,256,314 | ​ | $ | 1,686,868
Accrued property taxes | ​ | ​ | 225,693 | ​ | ​ | —
Accrued professional fees | ​ | ​ | 196,165 | ​ | ​ | 331,204
Current portion – preferred stock repurchase | ​ |  | 1,071,637 | ​ |  | 1,092,282
Other accrued expenses | ​ |  | 79,312 | ​ |  | 288,550
Total | ​ | $ | 3,829,121 | ​ | $ | 3,398,904

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