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Other income and other losses (Details) - ZHEJIANG TIANLAN - CNY (¥) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Impairment gain on contract assets | ¥ 2,158,000 | ¥ 0 | ¥ 0
Gain on disposal of property, plant and equipment | 0 | 0 | 39,000
Investment income | 2,863,000 | 824,000 | 531,000
Compensation income | 7,796,000 | 0 | 0
Amounts waived by payees | 0 | 980,000 | 3,061,000
Reversal of allowance for doubtful accounts | 10,841,000 | 983,000 | 183,000
Subsidy income from PRC government | 9,088,000 | 9,002,000 | 7,780,000
Other income | ¥ 32,746,000 | ¥ 11,789,000 | ¥ 11,594,000

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