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Related party transactions (Details Narrative)	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2022 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 CNY (¥)	Dec. 31, 2020 USD ($)
Proceeds from sale of long-term investment | $	$ 0		$ 0		$ 148,000
Blue Sky
Proceeds from sale of long-term investment | $	$ 148,000
ZHEJIANG TIANLAN | Engineering Service
Investment | ¥				¥ 273,000
Remuneration | ¥		¥ 1,083,000		¥ 1,209,000

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3179-108585

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