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v3.25.1

Income taxes (Details 1) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥)
Income before income tax | $ | $ 917 |  | $ 1,695 |  | $ 563 |
Hong Kong |  |  |  |  |  |
Income before income tax | $ | 519 |  | 1,695 |  | 563 |
Computed tax using respective companies' statutory tax rates | $ | (100) |  | 78 |  | 131 |
Tax effect of expenses not deductible for tax purposes | $ | (34) |  | (44) |  | (213) |
Change in valuation allowances | $ | 62 |  | (79) |  | 58 |
Income taxes credit / (expense) at effective tax rate | $ | $ (72) |  | $ (45) |  | $ (24) |
ZHEJIANG TIANLAN |  |  |  |  |  |
Income before income tax |  | ¥ 14,831 |  | ¥ 86,606 |  | ¥ 15,398
Computed tax using respective companies' statutory tax rates |  | 2,152 |  | 12,991 |  | 2,309
(Over)-provision for income tax in prior years |  | 5 |  | (591) |  | (69)
Temporary differences |  | 1,090 |  | 2,931 |  | 2,089
Tax effect of expenses not deductible for tax purposes |  | 699 |  | 4,472 |  | 500
Tax effect of special deduction for research and development costs |  | (4,081) |  | (3,734) |  | (5,257)
Tax effect of revenue not subject to tax |  |  |  |  |  | 3
Others |  | 510 |  |  |  | 57
Income taxes credit / (expense) at effective tax rate |  | ¥ 365 |  | ¥ 16,069 |  | ¥ (368)

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