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Summary of significant accounting policies (Details) | 12 Months Ended
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Dec. 31, 2018
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

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