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

X
- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2155824 + Details
Name: | us-gaap_PropertyPlantAndEquipmentEstimatedUsefulLives
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration