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Income taxes (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥)
The provision / (credit) for income taxes consist of: |  |  |  |  |  |
Current tax expenses: Hong Kong profits tax and the PRC EIT | $ | $ 0 |  | $ (346) |  | $ 0 |
Income tax (credit) / expense | $ | 0 |  | (346) |  | 0 |
Deferred tax expenses: Hong Kong and the PRC | $ | 37 |  | 34 |  | 28 |
Total deferred tax expense / (credit) | $ | 37 |  | 34 |  | 28 |
Total expense / (credit) | $ | $ 37 |  | $ (312) |  | $ 28 |
ZHEJIANG TIANLAN |  |  |  |  |  |
The provision / (credit) for income taxes consist of: |  |  |  |  |  |
Current PRC EIT | ¥ |  | ¥ 28 |  | ¥ 2 |  | ¥ 4,237
Income tax (credit) / expense | ¥ |  | 28 |  | 2 |  | 4,237
Deferred tax expense / (credit) | ¥ |  | 268 |  | (7,969) |  | (405)
Total deferred tax expense / (credit) | ¥ |  | 268 |  | (7,969) |  | (405)
Total expense / (credit) | ¥ |  | ¥ 296 |  | ¥ (7,967) |  | ¥ 3,832

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