4. Income taxes (Details 3) ¥ in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 CNY (¥)	Dec. 31, 2012 USD ($)
Income taxes \| $		$ 18		$ 73		$ 142
ZHEJIANG JIAHUAN
Income taxes \| ¥	¥ 484		¥ 19		¥ 0

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Income Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6515339

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration