XML 51 R40.htm IDEA: XBRL DOCUMENT

Summary of significant accounting policies (Tables)

12 Months Ended

Dec. 31, 2019

Property, plant and equipment

Office premises	47 to 51 years
Leasehold improvements whichever is less	over terms of the leases or the useful lives
Furniture, fixtures and office equipment	3 to 5 years
Motor vehicles	4 years
Testing equipment	3 years

Engineering segment backlog

	2019				2018
	US $'000				US $'000
Engineering segment	$	8,611			$	4,303

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
Plant and machineries	5 to 10 years, with 5% residual value
Furniture, fixtures and office equipment	5 years, with 5% residual value
Motor vehicles	5 years, with 5% residual value