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11. Land use right, net (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
ZHEJIANG TIANLAN
Land use right	¥ 7,361	¥ 7,361
Less: Accumulated amortisation	(1,316)	(1,167)
Net	6,045	6,194
Amortisation expense	149	141	¥ 177
ZHEJIANG JIAHUAN
Land use right	7,987	7,987
Less: Accumulated amortisation	(1,373)	(1,210)
Net	6,614	6,777
Amortisation expense	¥ 163	¥ 163	¥ 163

X

- References

No definition available.

+ Details

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Namespace Prefix:	CLWT_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	CLWT_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	CLWT_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Gross carrying amount before accumulated amortization as of the balance sheet date of an intangible asset that arises from a contractual arrangement with a third party (not including franchise rights and license agreements).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

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Balance Type:	debit
Period Type:	instant

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- Details

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Namespace Prefix:
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Balance Type:
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- Details

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