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Contract assets and liabilities (Details 1)
¥ in Thousands, $ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Costs and estimated earnings on uncompleted contracts $ 1,904   $ 5,150  
Less: billings to date (2,765)   (5,578)  
Costs and estimated earnings on uncompleted contracts in excess of billings (861)   (428)  
Unbilled revenue 202   441  
Deferred revenue $ (1,063)   $ (869)  
ZHEJIANG TIANLAN        
Costs and estimated earnings on uncompleted contracts | ¥   ¥ 406,064   ¥ 433,195
Less: billings to date | ¥   (358,705)   (408,132)
Costs and estimated earnings on uncompleted contracts in excess of billings | ¥   ¥ 47,359   ¥ 25,063