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4. Income taxes (Details 1) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 CNY (¥) | Dec. 31, 2014 USD ($)
Income before income taxes | $ |  | $ (640) |  | $ (1,904) |  | $ (879)
Computed tax using respective companies’ statutory tax rates | $ |  | (136) |  | (177) |  | (194)
Change in valuation allowances | $ |  | 350 |  | 455 |  | 93
Under (Over) - provision for income tax in prior years | $ |  | 0 |  | (69) |  | 0
Non deductible expenses | $ |  | 14 |  | (256) |  | 119
Total provision / (credit) for income tax at effective tax rate | $ |  | $ 228 |  | $ (47) |  | $ 18
ZHEJIANG JIAHUAN |  |  |  |  |  |
Income before income taxes | ¥ 11,849 |  | ¥ 5,797 |  | ¥ 5,194 |
Computed tax using respective companies’ statutory tax rates | 2,326 |  | 1,119 |  | 1,299 |
Under (Over) - provision for income tax in prior years | (9) |  | 189 |  | (278) |
Tax effect on revenue not subject to tax | (930) |  | (447) |  | (537) |
Non deductible expenses |  |  | 0 |  | 0 |
Others |  |  | 0 |  | 0 |
Total provision / (credit) for income tax at effective tax rate | 1,387 |  | 861 |  | 484 |
ZHEJIANG TIANLAN |  |  |  |  |  |
Income before income taxes | 27,603 |  | 24,927 |  | 14,776 |
Computed tax using respective companies’ statutory tax rates | 4,078 |  | 3,767 |  | 2,216 |
Under (Over) - provision for income tax in prior years | 57 |  | 0 |  | (2,418) |
Permanent difference | (82) |  | 0 |  | 0 |
Temporary differences | (1,337) |  | (177) |  | 1,575 |
Tax effect on revenue not subject to tax | (901) |  | (1,068) |  | (695) |
Non deductible expenses | 2,732 |  | 596 |  | 90 |
Tax effect of unused tax losses not recognized | 414 |  | 56 |  | 0 |
Total provision / (credit) for income tax at effective tax rate | ¥ 4,961 |  | ¥ 3,174 |  | ¥ 768 |

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