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Income taxes (Details) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥)
Current taxes (expense ) |  |  |  |  |  |
Current taxes (expense): Hong Kong profits tax and the PRC EIT | $ | $ 0 |  | $ (57,000) |  | $ (4,000) |
Income tax expense | $ | 0 |  | (57,000) |  | (4,000) |
Deferred tax credit / (expenses): Hong Kong and the PRC | $ | (24,000) |  | 147,000 |  | (92,000) |
Total deferred tax credit / (expense) | $ | (24,000) |  | 147,000 |  | (92,000) |
Total credit / (expense) | $ | $ (24,000) |  | $ 90,000 |  | $ (96,000) |
ZHEJIANG TIANLAN |  |  |  |  |  |
Current taxes (expense ) |  |  |  |  |  |
Total deferred tax credit / (expense) | ¥ |  | ¥ (361) |  | ¥ (666) |  | ¥ 1,101
Total credit / (expense) | ¥ |  | (368) |  | (698) |  | 1,858
Current tax (credit) / expense : PRC EIT | ¥ |  | (7) |  | (32) |  | 757
Income tax (credit) / expense | ¥ |  | (7) |  | (32) |  | 757
Deferred tax (credit) / expense | ¥ |  | ¥ (361) |  | ¥ (666) |  | ¥ 1,101

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