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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 |

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