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Land use right, net (Details 1) - ZHEJIANG TIANLAN - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Amortisation expense ¥ 149 ¥ 149 ¥ 149
2019 149    
2020 149    
2021 149    
2022 149    
2023 149    
Thereafter 4,695    
Total ¥ 5,440 ¥ 5,598