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Income taxes (Details) ¥ 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 (¥)
Profit/(loss before) income taxes/(benefit): The PRC and Hong Kong | $ | $ (564) |  | $ (640) |  | $ (1,904) |
The provision / (credit) for income taxes consist of: |  |  |  |  |  |
Current tax expenses: The PRC and Hong Kong | $ | 0 |  | 212 |  | (72) |
Total current provision / (credit) | $ | 0 |  | 212 |  | (72) |
Deferred tax expenses: The PRC and Hong Kong | $ | 28 |  | 16 |  | 25 |
Total deferred provision | $ | 28 |  | 16 |  | 25 |
Income taxes (expense) / credit | $ | $ 28 |  | $ 228 |  | $ (47) |
ZHEJIANG TIANLAN |  |  |  |  |  |
Profit/(loss before) income taxes/(benefit): The PRC and Hong Kong |  | ¥ 30,047 |  | ¥ 27,603 |  | ¥ 24,927
The provision / (credit) for income taxes consist of: |  |  |  |  |  |
Current PRC EIT Domestic |  | 4,237 |  | 6,298 |  | 3,351
Total current provision / (credit) |  | 4,237 |  | 6,298 |  | 3,351
Deferred tax benefit |  | (405) |  | (1,337) |  | (177)
Total deferred provision |  | (405) |  | (1,337) |  | (177)
Income taxes (expense) / credit |  | 3,832 |  | 4,961 |  | 3,174
ZHEJIANG JIAHUAN |  |  |  |  |  |
Profit/(loss before) income taxes/(benefit): The PRC and Hong Kong |  | 4,314 |  | 11,848 |  | 5,797
The provision / (credit) for income taxes consist of: |  |  |  |  |  |
Income taxes (expense) / credit |  | ¥ 263 |  | ¥ 1,387 |  | ¥ 861

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