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Income taxes (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CNY (¥)
Current taxes (expense): Hong Kong profits tax and the PRC EIT | $ | $ (45) |  | $ 0 |  | $ (57) |
Income tax expense | $ | (45) |  | 0 |  | (57) |
Deferred tax credit / (expenses): Hong Kong and the PRC | $ | 0 |  | (24) |  | 147 |
Total deferred tax credit / (expense) | $ | 0 |  | (24) |  | 147 |
Total credit / (expense) | $ | $ (45) |  | $ (24) |  | $ 90 |
ZHEJIANG TIANLAN |  |  |  |  |  |
Income tax expense/(credit) PRC EIT | ¥ |  | ¥ 7,340 |  | ¥ (7) |  | ¥ (32)
Income tax expense | ¥ |  | 7,340 |  | (7) |  | (32)
Deferred tax expense / (credit) | ¥ |  | 8,729 |  | (361) |  | (666)
Total deferred tax credit / (expense) | ¥ |  | 8,729 |  | (361) |  | (666)
Total credit / (expense) | ¥ |  | ¥ 16,069 |  | ¥ (368) |  | ¥ (698)

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