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v3.21.1

Accounts receivable, net (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Accounts receivable, net. |  |  |
Trade accounts receivable | $ 21,422,782 | $ 22,862,706 |
Receivable from OC-BVI | 62,171 | 10,808 |
Other accounts receivable | 269,133 | 222,381 |
Accounts Receivable, Gross, Current | 21,754,086 | 23,095,895 |
Allowance for doubtful accounts | (270,110) | (142,236) | $ (158,902)
Accounts receivable, net | $ 21,483,976 | $ 22,953,659 |

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