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Accounts receivable (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	$ 8,235,514	$ 10,722,177
Receivable - construction project	521,250	415,305
Receivable from OC-BVI	45,118	49,154
Other accounts receivable	920,472	780,446
Accounts Receivable, Gross, Current	9,722,354	11,967,082
Allowance for doubtful accounts	(193,338)	(193,338)	$ (223,043)
Accounts Receivable, Net, Current	$ 9,529,016	$ 11,773,744

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- Definition

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

+ References

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.

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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.

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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.

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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
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3)
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-Publisher SEC
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-Number 210
-Section 03
-Paragraph 3
-Subparagraph a, b
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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).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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