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Other income net (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Exchange gain / (loss), net | $ $ 77,000   $ 101,000   $ (30,000)  
Rental income | $ 50,000   59,000   82,000  
Government subsidies - Employment Support Scheme | $ 0   147,000   0  
Other income, net | $ 127,000   307,000   52,000  
Other income | $ $ 127,000   $ 307,000   $ 52,000  
ZHEJIANG TIANLAN            
Compensation income   ¥ 0   ¥ 22,548,000   ¥ 0
Gain on disposal of property, plant and equipment   39,000   0   39,000
Investment income   531,000   266,000   0
Amounts waived by payees   3,061,000   4,535,000   280,000
Reversal of allowance for doubtful accounts   183,000   6,463,000   0
Subsidy income from PRC government   7,780,000   5,834,000   5,957,000
Other income   11,594,000   39,646,000   6,276,000
Bad debts written off   0   0   5,383,000
Impairment loss on contract assets   1,238,000   1,399,000   0
Impairment loss on long-term investments   0   1,340,000   0
Impairment loss on property, plant and equipment   0   2,742,000   0
Investment loss   0   0   241,000
Other losses   ¥ 1,238,000   ¥ 5,481,000   ¥ 5,624,000