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Land use right, net (Details 1) - ZHEJIANG TIANLAN - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Amortization expense ¥ 159 ¥ 149 ¥ 149
2021 159    
2022 159    
2023 159    
2024 159    
2025 159    
Thereafter 4,352    
Total ¥ 5,147