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Note 3 - Summary of significant accounting policies (Detail) - The exchange rates used to translate amounts in RMB into US$	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Items in the statements of income and comprehensive income, and statements of cash flows	6.2816	6.3161	6.2858	6.3201

X

- Definition

Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 30

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521

+ Details

Name:	us-gaap_ForeignCurrencyExchangeRateTranslation1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant