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Income taxes (Details 1) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥)
(Loss) / income before income taxes | $ | $ (310) |  | $ (963) |  | $ (564) |
Computed tax using respective companies' statutory tax rates | $ | (69) |  | (254) |  | (94) |
Change in valuation allowances | $ | (30) |  | 68 |  | 120 |
Under / (over-provision) for income taxes in prior years | $ | 5 |  | (131) |  | 0 |
Tax effect of expenses not deductible for tax purposes | $ | 131 |  | 5 |  | 2 |
Income taxes expense / (credit) at effective tax rate | $ | $ 37 |  | $ (312) |  | $ 28 |
ZHEJIANG TIANLAN |  |  |  |  |  |
(Loss) / income before income taxes |  | ¥ 4,654 |  | ¥ (34,194) |  | ¥ 30,047
Computed tax using respective companies' statutory tax rates |  | 642 |  | (4,987) |  | 4,548
Under / (over-provision) for income taxes in prior years |  | 0 |  | 0 |  | (29)
Permanent difference |  | 0 |  | 0 |  | (459)
Temporary differences |  | 202 |  | (272) |  | (405)
Tax effect on revenue not subject to tax |  | 0 |  | (3,024) |  | (1,438)
Tax effect of expenses not deductible for tax purposes |  | 693 |  | 316 |  | 1,435
Tax effect of unused tax losses not recognized |  | 0 |  | 0 |  | 180
Tax effect of special deduction for research and development costs |  | (2,103) |  | 0 |  | 0
Others |  | 862 |  | 0 |  | 0
Income taxes expense / (credit) at effective tax rate |  | ¥ 296 |  | ¥ (7,967) |  | ¥ 3,832

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