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Lease obligations (Details 2)
¥ in Thousands, $ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Operating lease right-of-use assets | $ $ 233   $ 406  
Current portion of long-term operating lease obligations | $ 118   170  
Long-term operating lease obligations, net of current maturities | $ 94   216  
Total operating lease liabilities | $ $ 212   $ 386  
ZHEJIANG TIANLAN        
Property, plant and equipment, at cost   ¥ 0   ¥ 121,208
Accumulated depreciation and impairment losses   0   (71,508)
Property, plant and equipment, net   0   49,700
Current maturities of long-term debt   0   25,785
Total finance lease liabilities   ¥ 0   ¥ 25,785