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Other income and other losses (Details) - ZHEJIANG TIANLAN ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($)
Impairment gain on contract assets | ¥ (722) | ¥ 2,158 |  | ¥ 0 |
Investment income | (8,504) | 2,863 |  | 824 |
Fait value gain on short term investment | 248 |  | $ 0 |  | $ 0
Compensation income | 193 | 7,796 |  | 0 |
Amounts waived by payees | 676 | 0 |  | 980 |
Reversal of allowance for doubtful accounts | (6,225) | 10,841 |  | 983 |
Subsidy income from PRC government | 14,730 | 9,088 |  | 9,002 |
Other income | ¥ 396 | ¥ 32,746 |  | ¥ 11,789 |

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