Amount of allowance for credit loss for right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-3

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Name:	us-gaap_ContractWithCustomerAssetAccumulatedAllowanceForCreditLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Contract assets and liabilities (Details 4) ¥ in Thousands, $ in Thousands	Dec. 31, 2024 USD ($)	Dec. 31, 2024 CNY (¥)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 CNY (¥)
Net contract liabilities \| $	$ (458)		$ (584)
Contract assets \| $	135		66
Unbilled revenue
Net contract liabilities \| $	135		66
Contract assets \| $	135		66
Deferred revenue
Net contract liabilities \| $	$ (593)		$ (650)
ZHEJIANG TIANLAN
Gross contract assets \| ¥		¥ 77,657		¥ 83,170
Less: allowance for doubtful accounts \| ¥		(11,013)		(10,290)
Net contract liabilities \| ¥		31,277		29,428
Contract assets \| ¥		66,644		72,880
ZHEJIANG TIANLAN \| Unbilled revenue
Contract assets \| ¥		¥ 66,644		¥ 72,880