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Contract assets and liabilities (Details 1) ¥ in Thousands, $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥)
--- | --- | --- | --- | ---
Contract liabilities Deferred revenue | $ | $ 650 |  | $ 625 |
ZHEJIANG TIANLAN |  |  |  |
Deferred revenue | ¥ |  | ¥ 43,452 |  | ¥ 34,503

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- Definition Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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