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7. Revolving line of credit (Details)	Jun. 30, 2014 USD ($)	Dec. 31, 2013 USD ($)	Nov. 01, 2013 CNY
Revolving line of credit
Revolving line of credit with a bank			30,000,000
Annual interest rate	6.60%
Outstanding balance due under revolving line of credit (RMB 30,000,000)	$ 4,873,928	$ 4,909,662

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- Definition

Annual interest rate

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- Definition

Outstanding balance due under revolving line of credit (RMB 30,000,000)

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No definition available.

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- Definition

RevolvingLineOfCreditWithABank1

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No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant