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20. Commitments and contingencies (Details Narrative) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2012 CNY	Dec. 31, 2011 CNY	Dec. 31, 2010 CNY
Commitments And Contingencies Details Narrative
Rental expenses	$ 291	$ 356	$ 384
Future minimum rental payments	262
Future minimum rental payments due in 2013	232
Future minimum rental payments due 2014 to 2016	30
Banking facilities
Amount available for draw in overdraft, import and export credits and foreign exchange contracts	1,538	1,154	2,564
Amount of banking facilities utilized for issuance of bank guarantees				285	474	188

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Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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