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Income taxes (Details 2) ¥ in Thousands, $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥)
--- | --- | --- | --- | ---
Tax losses | $ | $ 901 |  | $ 858 |
Temporary differences | $ | (5) |  | (19) |
Less: valuation allowances | $ | (901) |  | (752) |
Net deferred tax assets | $ | $ (5) |  | $ 87 |
ZHEJIANG TIANLAN |  |  |  |
Allowance for doubtful debts |  | ¥ 6,184 |  | ¥ 7,464
Deferred government grant |  | 750 |  | 0
Impairment losses on assets |  | 6,705 |  | 5,025
Tax losses |  | 0 |  | 1,481
Net deferred tax assets |  | ¥ 13,639 |  | ¥ 13,970

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