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Income taxes (Details 1) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CNY (¥)
Income before income taxes | $ | $ (963) |  | $ (564) |  | $ (640) |
Computed tax using respective companies' statutory tax rates | $ | (254) |  | (94) |  | (136) |
Change in valuation allowances | $ | 68 |  | 120 |  | 350 |
(Over) under provision for income taxes in prior years | $ | (131) |  | 0 |  | 0 |
Tax effect of expenses not deductible for tax purposes | $ | 5 |  | 2 |  | 14 |
Total (credit) / provision for income taxes at effective tax rate | $ | $ (312) |  | $ 28 |  | $ 228 |
ZHEJIANG TIANLAN |  |  |  |  |  |
Income before income taxes |  | ¥ (34,194) |  | ¥ 30,047 |  | ¥ 27,603
Computed tax using respective companies' statutory tax rates |  | (4,987) |  | 4,548 |  | 4,078
(Over) under provision for income taxes in prior years |  | 0 |  | (29) |  | 57
Permanent difference |  | 0 |  | (459) |  | (82)
Temporary differences |  | (272) |  | (405) |  | (1,337)
Tax effect on revenue not subject to tax |  | (3,024) |  | (1,438) |  | (901)
Tax effect of expenses not deductible for tax purposes |  | 316 |  | 1,435 |  | 2,732
Tax effect of unused tax losses not recognized |  | 0 |  | 180 |  | 414
Total (credit) / provision for income taxes at effective tax rate |  | ¥ (7,967) |  | ¥ 3,832 |  | ¥ 4,961

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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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