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Other income and other losses (Details 1) - ZHEJIANG TIANLAN ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022 CNY (¥)	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)
Impairment loss on short term investments	¥ 195	¥ 0		¥ 1,340
Impairment loss on contract assets	3,560	1,238		1,399
Impairment loss on long-term investments	0		$ 0	1,340
Impairment loss on property, plant and equipment	0	0		2,742
Other losses	¥ 3,755	¥ 1,238		¥ 5,481

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Amount of gain (loss) related to nonoperating activities, classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7,9)
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

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