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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     7,869us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
/ us-gaap_StatementScenarioAxis
= CLWT_Subsidiary2Member		 461us-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