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4. Income taxes (Details 2) In Thousands, unless otherwise specified	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2014 ZHEJIANG TIANLAN CNY	Dec. 31, 2013 ZHEJIANG TIANLAN CNY
The components of deferred tax assets are as follows:
Tax losses	$ 1,131CLWT_DeferredTaxAssetTaxLosses	$ 1,045CLWT_DeferredTaxAssetTaxLosses	0CLWT_DeferredTaxAssetTaxLosses / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember	0CLWT_DeferredTaxAssetTaxLosses / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember
Temporary differences	4CLWT_DeferredTaxAssetTemporaryDifferences	6CLWT_DeferredTaxAssetTemporaryDifferences
Allowance for doubtful debts			4,350us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember	2,959us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember
Less: Valuation allowances	(908)us-gaap_DeferredTaxAssetsValuationAllowance	(815)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets	$ 227us-gaap_DeferredTaxAssetsNet	$ 236us-gaap_DeferredTaxAssetsNet	4,350us-gaap_DeferredTaxAssetsNet / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember	2,959us-gaap_DeferredTaxAssetsNet / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember

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- Definition

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b),(c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the allowance for doubtful accounts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 25

-Paragraph 20

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28680-109314

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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