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Income taxes (Details 2) ¥ in Thousands, $ in Thousands | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CNY (¥)
--- | --- | --- | --- | ---
Tax losses | $ | $ 858 |  | $ 975 |
Temporary differences | $ | (19) |  | (17) |
Less: valuation allowances | $ | (752) |  | (834) |
Net deferred tax assets | $ | $ 87 |  | $ 124 |
ZHEJIANG TIANLAN |  |  |  |
Allowance for doubtful debts | ¥ |  | ¥ 7,464 |  | ¥ 13,201
Impairment losses on assets | ¥ |  | 5,025 |  | 0
Tax losses | ¥ |  | 1,481 |  | 1,037
Net deferred tax assets | ¥ |  | ¥ 13,970 |  | ¥ 14,238

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