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Accounts receivable, net (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Accounts receivable, net. |  |  |
Trade accounts receivable | $ 27,163,719 | $ 27,311,188 |
Receivable from OC-BVI | 37,293 | 40,877 |
Other accounts receivable | 28,384 | 180,262 |
Accounts Receivable, Gross, Current | 27,229,396 | 27,532,327 |
Allowance for doubtful accounts | (183,214) | (183,020) | $ (172,269)
Accounts receivable, net | $ 27,046,182 | $ 27,349,307 |

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