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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
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Items in the statements of income and comprehensive income, and statements of cash flows | 6.2816 | 6.3161 | 6.2858 | 6.3201

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