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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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- Definition

Carrying value as of the balance sheet date of other receivables. Used to reflect the current portion of the assets (receivable within one year or within the normal operating cycle if longer).

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due within 1 year (or 1 business cycle).

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