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Income taxes (Details 1) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 CNY (¥)
Income before income taxes | $ | $ (564) |  | $ (640) |  | $ (1,904) |
Computed tax using respective companies’ statutory tax rates | $ | (94) |  | (136) |  | (177) |
Change in valuation allowances | $ | 120 |  | 350 |  | 455 |
Under / (over) provision for income tax in prior years | $ | 0 |  | 0 |  | (69) |
Tax effect of expenses not deductible for tax purposes | $ | 2 |  | 14 |  | (256) |
Total provision / (credit) for income tax at effective tax rate | $ | $ 28 |  | $ 228 |  | $ (47) |
ZHEJIANG TIANLAN |  |  |  |  |  |
Income before income taxes |  | ¥ 30,047 |  | ¥ 27,603 |  | ¥ 24,927
Computed tax using respective companies’ statutory tax rates |  | 4,548 |  | 4,078 |  | 3,767
Under / (over) provision for income tax in prior years |  | (29) |  | 57 |  | 0
Permanent difference |  | (459) |  | (82) |  | 0
Temporary differences |  | (405) |  | (1,337) |  | (177)
Tax effect on revenue not subject to tax |  | (1,438) |  | (901) |  | (1,068)
Tax effect of expenses not deductible for tax purposes |  | 1,435 |  | 2,732 |  | 596
Tax effect of unused tax losses not recognized |  | 180 |  | 414 |  | 56
Total provision / (credit) for income tax at effective tax rate |  | 3,832 |  | 4,961 |  | 3,174
ZHEJIANG JIAHUAN |  |  |  |  |  |
Income before income taxes |  | 4,314 |  | 11,848 |  | 5,797
Computed tax using respective companies’ statutory tax rates |  | 988 |  | 2,326 |  | 1,119
Under / (over) provision for income tax in prior years |  | 27 |  | (9) |  | 189
Tax effect on revenue not subject to tax |  | (752) |  | (930) |  | (447)
Total provision / (credit) for income tax at effective tax rate |  | ¥ 263 |  | ¥ 1,387 |  | ¥ 861

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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