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Accounts receivable (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	$ 18,666,283	$ 12,098,566
Receivable from affiliate	53,867	110,544
Other accounts receivable	362,453	530,399
Accounts Receivable, Gross, Current	19,082,603	12,739,509
Allowance for doubtful accounts	(223,043)	(223,043)	(160,134)
Accounts Receivable, Net, Current, Total	$ 18,859,560	$ 12,516,466

X

- 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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X

- 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)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Publisher SEC

-Name Regulation S-X (SX)

-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

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

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-Name Accounting Standards Codification

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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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