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Other income and other losses (Details 1) - ZHEJIANG TIANLAN | 12 Months Ended
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Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($)
Impairment loss on short term investments | ¥ 0 | ¥ 195,000 | ¥ 0 |
Impairment loss on contract assets | 0 | 3,560,000 | 1,238,000 |
Impairment loss on long-term investments | 0 | 0 |  | $ 0
Other losses | ¥ 0 | ¥ 3,755,000 | ¥ 1,238,000 |

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- Definition Amount of gain (loss) related to nonoperating activities, classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7,9) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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