XML 52 R40.htm IDEA: XBRL DOCUMENT v3.21.1
Summary of significant accounting policies (Tables)
 12 Months Ended
Dec. 31, 2020
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
Engineering segment backlog
    2020     2019  
    US$’000     US$’000  
             
   Engineering segment     11,581       8,611  
ZHEJIANG TIANLAN  
Property, plant and equipment
   Land use right Over terms of the leases 
   Buildings and leasehold improvements  11 to 50 years, with 5% residual value
   Furniture, fixtures and office equipment 5 years, with 5% residual value
   Motor vehicles  5 years, with 5% residual value  
   Plant and machineries  5 to 10 years, with 5% residual value