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Income taxes (Details 1) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CNY (¥)
Income / (loss) before income taxes | $ | $ 498 |  | $ (173) |  | $ (373) |
Computed tax using respective companies' statutory tax rates | $ | 133 |  | 69 |  | 254 |
Change in valuation allowances | $ | 48 |  | 30 |  | (68) |
Under / (over-provision) for income taxes in prior years | $ | 0 |  | (5) |  | 131 |
Tax effect of expenses not deductible for tax purposes | $ | (277) |  | (131) |  | (5) |
Income taxes (expense) / credit | $ | $ (96) |  | $ (37) |  | $ 312 |
ZHEJIANG TIANLAN |  |  |  |  |  |
Income / (loss) before income taxes |  | ¥ 15,358 |  | ¥ 4,654 |  | ¥ (34,194)
Computed tax using respective companies' statutory tax rates |  | 2,304 |  | 642 |  | (4,987)
Under / (over-provision) for income taxes in prior years |  | (48) |  | 0 |  | 0
Temporary differences |  | 182 |  | 202 |  | (272)
Tax effect on revenue not subject to tax |  | 0 |  | 0 |  | (3,024)
Tax effect of expenses not deductible for tax purposes |  | 2,306 |  | 693 |  | 316
Tax effect of special deduction for research and development costs |  | (3,001) |  | (2,103) |  | 0
Others |  | 115 |  | 862 |  | 0
Income taxes (expense) / credit |  | ¥ (1,858) |  | ¥ (296) |  | ¥ 7,967

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