Related party transactions (Details Narrative)	12 Months Ended
Dec. 31, 2023 CNY (¥)	Dec. 31, 2022 CNY (¥)	Dec. 31, 2020 USD ($)
Proceeds from sale of long-term investment \| $			$ 148,000
ZHEJIANG TIANLAN
Investment	¥ 4,469,000	¥ 4,399,000
ZHEJIANG TIANLAN \| Engineering Service
Investment	0
Remuneration	¥ 1,878,000	¥ 1,083,000

Sum of the carrying amounts as of the balance sheet date of all investments.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(h))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

Name:	us-gaap_Investments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant