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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
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The components of deferred tax assets are as follows: |  |  |  |
Tax losses | $ 1,131 CLWT_DeferredTaxAssetTaxLosses | $ 1,045 CLWT_DeferredTaxAssetTaxLosses | 0 CLWT_DeferredTaxAssetTaxLosses / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | 0 CLWT_DeferredTaxAssetTaxLosses / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember
Temporary differences | 4 CLWT_DeferredTaxAssetTemporaryDifferences | 6 CLWT_DeferredTaxAssetTemporaryDifferences |  |
Allowance for doubtful debts |  |  | 4,350 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | 2,959 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember
Less: Valuation allowances | (908)us-gaap_DeferredTaxAssetsValuationAllowance | (815)us-gaap_DeferredTaxAssetsValuationAllowance |  |
Net deferred tax assets | $ 227 us-gaap_DeferredTaxAssetsNet | $ 236 us-gaap_DeferredTaxAssetsNet | 4,350 us-gaap_DeferredTaxAssetsNet / us-gaap_StatementScenarioAxis = us-gaap_SubsidiaryIssuerMember | 2,959 us-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 + Details
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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 + Details
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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 + Details
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