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2. Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Property, Plant and Equipment |
Office premises | 47 to 51 years
Leasehold improvements | over terms of the leases or the useful lives whichever is less
Furniture, fixtures and office equipment | 3 to 5 years
Motor vehicles | 4 years
Testing equipment | 3 years
ZHEJIANG |
Property, Plant and Equipment |
Land use right |  | Over terms of the leases
Office premises |  | 47-50 years
Leasehold improvements |  | over terms of the leases or the useful lives whichever is less
Plant and machineries |  | 5 to 10 years
Furniture, fixtures and office equipment |  | 5 years
Motor vehicles |  | 5 years

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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | CLWT_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration