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Property, plant and equipment, net (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 (¥)
Depreciation charge | $ | $ 61 |  | $ 55 |  | $ 56 |
ZHEJIANG TIANLAN |  |  |  |  |  |
Depreciation charge |  | ¥ 12,647 |  | ¥ 14,144 |  | ¥ 8,473
ZHEJIANG JIAHUAN |  |  |  |  |  |
Depreciation charge |  | ¥ 2,093 |  | ¥ 2,211 |  | ¥ 2,296

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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