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4. Income taxes (Details)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2014
ZHEJIANG TIANLAN
CNY
Dec. 31, 2013
ZHEJIANG TIANLAN
CNY
Dec. 31, 2012
ZHEJIANG TIANLAN
CNY
Profit/(loss before) income taxes/(benefit): The PRC and Hong Kong $ (879)CLWT_ProfitlossBeforeIncomeTaxesbenefitPrcAndHongKong $ (157)CLWT_ProfitlossBeforeIncomeTaxesbenefitPrcAndHongKong $ 13CLWT_ProfitlossBeforeIncomeTaxesbenefitPrcAndHongKong      
The provision for income taxes consists of:            
Current tax expenses: The PRC and Hong Kong 8CLWT_CurrentTaxExpensesPrcAndHongKong 47CLWT_CurrentTaxExpensesPrcAndHongKong 117CLWT_CurrentTaxExpensesPrcAndHongKong      
Current PRC EIT Domestic       3,950CLWT_CurrentPrcEitDomestic
/ us-gaap_StatementScenarioAxis
= us-gaap_SubsidiaryIssuerMember
3,110CLWT_CurrentPrcEitDomestic
/ us-gaap_StatementScenarioAxis
= us-gaap_SubsidiaryIssuerMember
1,650CLWT_CurrentPrcEitDomestic
/ us-gaap_StatementScenarioAxis
= us-gaap_SubsidiaryIssuerMember
Total current provision 8us-gaap_CurrentIncomeTaxExpenseBenefit 47us-gaap_CurrentIncomeTaxExpenseBenefit 117us-gaap_CurrentIncomeTaxExpenseBenefit 3,950us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_SubsidiaryIssuerMember
3,110us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_SubsidiaryIssuerMember
1,650us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_SubsidiaryIssuerMember
Deferred tax benefit: The PRC and Hong Kong 10CLWT_DeferredTaxBenefitPrcAndHongKong 26CLWT_DeferredTaxBenefitPrcAndHongKong 25CLWT_DeferredTaxBenefitPrcAndHongKong      
Deferred tax benefit:       (1,391)CLWT_DeferredTaxBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_SubsidiaryIssuerMember
(447)CLWT_DeferredTaxBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_SubsidiaryIssuerMember
784CLWT_DeferredTaxBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_SubsidiaryIssuerMember
Total deferred provision $ 10CLWT_TotalDeferredTaxProvision $ 26CLWT_TotalDeferredTaxProvision $ 25CLWT_TotalDeferredTaxProvision (1,391)CLWT_TotalDeferredTaxProvision
/ us-gaap_StatementScenarioAxis
= us-gaap_SubsidiaryIssuerMember
(447)CLWT_TotalDeferredTaxProvision
/ us-gaap_StatementScenarioAxis
= us-gaap_SubsidiaryIssuerMember
784CLWT_TotalDeferredTaxProvision
/ us-gaap_StatementScenarioAxis
= us-gaap_SubsidiaryIssuerMember