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Income taxes (Details 2) $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥)
--- | --- | --- | --- | ---
Tax losses | $ | $ 572 |  | $ 649 |
Temporary differences | $ | 0 |  | 0 |
Less: valuation allowances | $ | (469) |  | (541) |
Net deferred tax assets / (liabilities) | $ | $ 103 |  | $ 108 |
ZHEJIANG TIANLAN |  |  |  |
Tax losses |  | ¥ 0 |  | ¥ 2,854
Allowance for doubtful accounts |  | 4,218 |  | 5,680
Deferred government grant |  | 213 |  | 154
Impairment losses on assets |  | 1,508 |  | 5,978
Total deferred tax assets |  | ¥ 5,939 |  | ¥ 14,666

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