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Accounts receivable, net (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	$ 13,609,203	$ 15,368,218
Receivable from OC-BVI	123,807	53,970
Other accounts receivable	1,473,738	1,271,948
Accounts Receivable, Gross, Current	15,206,748	16,694,136
Allowance for doubtful accounts	(158,902)	(193,338)	$ (193,338)
Accounts receivable, net	$ 15,047,846	$ 16,500,798

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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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Carrying value as of the balance sheet date of trade 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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

+ References

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-Publisher FASB
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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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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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