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Income taxes (Details 2) $ in Thousands | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($)
--- | --- | --- | --- | ---
Tax losses | $ |  | $ 614 |  | $ 901
Temporary differences | $ |  | (3) |  | (5)
Less: valuation allowances | $ |  | (469) |  | (901)
Net deferred tax assets / (liabilities) | $ |  | $ 142 |  | $ (5)
ZHEJIANG TIANLAN |  |  |  |
Tax losses | ¥ 594,000 |  | ¥ 0 |
Allowance for doubtful debts | 6,188,000 |  | 6,184,000 |
Deferred government grant | 583,000 |  | 750,000 |
Impairment losses on assets | 6,940,000 |  | 6,705,000 |
Net deferred tax assets | ¥ 14,305,000 |  | ¥ 13,639,000 |

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