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2. Summary of significant accounting policies (Details)
 12 Months Ended
Dec. 31, 2013
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 TIANLAN Land Use Right
  
Useful lives Over terms of the leases
ZHEJIANG TIANLAN Office Premises
  
Useful lives 47-50 years, with 5% residual value
ZHEJIANG TIANLAN Leasehold improvements
  
Useful lives over terms of the leases or the useful lives whichever is less, with 5% residual value
ZHEJIANG TIANLAN Plant and machineries
  
Useful lives 5 to 10 years, with 5% residual value
ZHEJIANG TIANLAN Furniture, fixtures and office equipment
  
Useful lives 3 to 5 years, with 5% residual value
ZHEJIANG TIANLAN Motor vehicles
  
Useful lives 1 to 8 years, with 5% residual value
ZHEJIANG JIAHUAN Land use right
  
Useful lives 50 years
ZHEJIANG JIAHUAN Buildings
  
Useful lives 20 years
ZHEJIANG JIAHUAN Plant and machinery
  
Useful lives 5 to 20 years
ZHEJIANG JIAHUAN Office equipment
  
Useful lives 3 to 10 years
ZHEJIANG JIAHUAN Motor vehicles
  
Useful lives 5 to 10 years