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OTHER ACCRUED LIABILITIES (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
OTHER ACCRUED LIABILITIES |  |
Prepayments from customers | $ 2,609,684 | $ 1,686,868
Accrued property taxes | 338,540 |
Accrued professional fees | 228,204 | 331,204
Current portion - preferred stock repurchase | 1,084,795 | 1,092,282
Other accrued expenses | 161,642 | 288,550
Total | $ 4,422,865 | $ 3,398,904

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