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6. Accounts receivable, net (Details 2) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2014 CNY (¥) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 CNY (¥)
Allowance for doubtful debts: Balance at beginning | $ |  | $ (69) |
Balance at end | $ |  | $ (48) |
ZHEJIANG JIAHUAN |  |  |
Allowance for doubtful debts: Balance at beginning | ¥ (8,000) |  | ¥ (8,461)
Recovered | 7,869 |  | 461
Balance at end | ¥ (131) |  | ¥ (8,000)

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of recoveries of receivables doubtful of collection that were previously charged off. + References No definition available. + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |