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Pension plan (Details Narrative) ¥ 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 (¥)
Aggregate contributions to pension plans and retirement benefit schemes | $ | $ 281 |  | $ 314 |  | $ 458 |
ZHEJIANG TIANLAN |  |  |  |  |  |
Aggregate contributions to pension plans and retirement benefit schemes |  | ¥ 4,298 |  | ¥ 3,905 |  | ¥ 3,850
ZHEJIANG JIAHUAN |  |  |  |  |  |
Aggregate contributions to pension plans and retirement benefit schemes |  | ¥ 1,317 |  | ¥ 1,799 |  |

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- Definition Amount of payment for pension benefits. Excludes other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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