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Summary of significant accounting policies (Details 1) | 12 Months Ended
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Dec. 31, 2021
Furniture, Fixtures and Office Equipment |
Useful lives | 3 to 5 years
Furniture, Fixtures and Office Equipment | ZHEJIANG TIANLAN |
Useful lives | 5 years, with 5% residual value
Motor Vehicles |
Useful lives | 4 years
Motor Vehicles | ZHEJIANG TIANLAN |
Useful lives | 5 years, with 5% residual value
Testing Equipment |
Useful lives | 3 years
Office Premises |
Useful lives | 47 to 51 years
Land Use Right | ZHEJIANG TIANLAN |
Useful lives | Over terms of the leases
Plant and Machineries | ZHEJIANG TIANLAN |
Useful lives | 5 to 10 years, with 5% residual value
Buildings and Leasehold Improvements | ZHEJIANG TIANLAN |
Useful lives | 11 to 50 years, with 5% residual value

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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126905813&loc=d3e1205-110223 + Details
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