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Accounts receivable net (Details 1)
 12 Months Ended
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Balance at beginning of period | $   $ 30,000   $ 30,000
Less: reversal of provision for doubtful accounts | $   (2,000)   0
Balance at end of period | $   $ 28,000   30,000
ZHEJIANG TIANLAN        
Balance at beginning of period ¥ 42,867,000   ¥ 42,182,000  
Less: reversal of provision for doubtful accounts (2,687,000)   0  
Balance at end of period 40,019,000   42,867,000  
Add: provision for allowances 822     $ 868
Less: reversal of provision for doubtful accounts ¥ (983,000)   ¥ (183,000)