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Income taxes (Details 2) ¥ in Thousands, $ in Thousands | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CNY (¥)
--- | --- | --- | --- | ---
Tax losses | $ 958 |  | $ 838 |
Temporary differences | (6) |  | (2) |
Less: valuation allowances | (794) |  | (650) |
Net deferred tax assets | $ 158 |  | $ 186 |
ZHEJIANG TIANLAN |  |  |  |
Tax losses | ¥ |  | ¥ 0 |  | ¥ 0
Allowance for doubtful debts | ¥ |  | 6,269 |  | 5,864
Net deferred tax assets | ¥ |  | ¥ 6,269 |  | ¥ 5,864

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