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6. Accounts receivable, net (Details 2) In Thousands, unless otherwise specified |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2014 ZHEJIANG JIAHUAN CNY | Dec. 31, 2013 ZHEJIANG JIAHUAN CNY
Allowance for doubtful debts: Balance at beginning | $ (48)us-gaap_AllowanceForDoubtfulAccountsReceivable | $ (69)us-gaap_AllowanceForDoubtfulAccountsReceivable | (8,000)us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member | (8,461)us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member
Recovered |  |  | 7,869 us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member | 461 us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member
Balance at end | $ (48)us-gaap_AllowanceForDoubtfulAccountsReceivable | $ (69)us-gaap_AllowanceForDoubtfulAccountsReceivable | (131)us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member | (8,000)us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_StatementScenarioAxis = CLWT_Subsidiary2Member

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of recoveries of receivables doubtful of collection that were previously charged off. + References No definition available. + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration