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Lease obligations (Details 1)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
USD ($)
Operating cash flows from operating leases | $ $ 195   $ 346    
Right-of-use asset obtained in exchange for new operating lease obligations | $ $ 0   $ 460   $ 0
ZHEJIANG TIANLAN          
Finance cash flows from finance leases | ¥   ¥ 11,263   ¥ 29,668  
Right-of-use assets obtained in exchange for lease obligations (noncash): finance leases | ¥   ¥ 0   ¥ 0