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Concentrations Sales And Purcahses (Details)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Concentrations Sales And Purcahses
Percentage of sales by customers	10.0	19.7
Percentage of purchases by suppliers	14.6	11.0
Percentage of purchases from three suppliers	28.7	18.1

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