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Summary of significant accounting policies (Details Narrative) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) shares | Dec. 31, 2020 CNY (¥) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2019 CNY (¥) shares | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CNY (¥)
Research and development costs | $ | $ 497 |  | $ 35 |  | $ 184 |
Advertising and promotional expenses | $ | $ 7 |  | $ 13 |  | $ 16 |
Shares issued | shares | 3,260,559 | 3,260,559 | 3,260,559 | 3,260,559 |  |
ZHEJIANG TIANLAN |  |  |  |  |  |
Research and development costs | ¥ |  | ¥ 28,589 |  | ¥ 19,018 |  | ¥ 14,363
Advertising and promotional expenses | ¥ |  | ¥ 0 |  | ¥ 0 |  | ¥ 0
Shares issued | shares | 82,572,000 | 82,572,000 | 82,572,000 | 82,572,000 |  |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The total expense recognized in the period for promotion, public relations, and brand or product advertising. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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