Accounts receivable (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	$ 15,368,218	$ 8,235,514
Receivable - construction project	0	521,250
Receivable from OC-BVI	53,970	45,118
Other accounts receivable	1,271,948	920,472
Accounts Receivable, Gross, Current	16,694,136	9,722,354
Allowance for doubtful accounts	(193,338)	(193,338)	$ (193,338)
Accounts Receivable, Net, Current	$ 16,500,798	$ 9,529,016

Carrying value as of the balance sheet date of accounts receivable construction project.

No definition available.

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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).

+ References

No definition available.

+ Details

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- Definition

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).

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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.

+ References

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- Definition

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.

+ References

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- Definition

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).

+ References

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