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Contract assets and liabilities (Details 1)
¥ in Thousands, $ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Costs and estimated earnings on uncompleted contracts $ 5,150   $ 6,354  
Less: billings to date (5,578)   (6,825)  
Costs and estimated earnings on uncompleted contracts in excess of billings (428)   (471)  
Unbilled revenue 441   899  
Deferred revenue $ (869)   $ (1,370)  
ZHEJIANG TIANLAN        
Costs and estimated earnings on uncompleted contracts | ¥   ¥ 433,195   ¥ 236,044
Less: billings to date | ¥   (352,234)   (135,050)
Costs and estimated earnings on uncompleted contracts in excess of billings | ¥   ¥ 80,961   ¥ 100,994