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Concentration and Major Customers and Suppliers (Details)	12 Months Ended
	Dec. 31, 2012 Supplier Customer	Dec. 31, 2011 Supplier Customer	Dec. 31, 2010 Supplier
Concentration and major customers and suppliers (Textual)
Number of major suppliers	2	3	3
Number of customer contributed over 10% of total sales	0	0
Supplier A [Member]
Concentration and major customers and suppliers (Textual)
Percentage of total purchase from major suppliers	77.00%	61.00%	51.00%
Supplier B [Member]
Concentration and major customers and suppliers (Textual)
Percentage of total purchase from major suppliers	8.00%	11.00%	13.00%
Supplier C [Member]
Concentration and major customers and suppliers (Textual)
Percentage of total purchase from major suppliers		6.00%	8.00%

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Number of customer contributed over 10% of total sales.

+ References

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Number of suppliers.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611

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