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Payables to third parties (Tables)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Text block1 [abstract]    
Payables to third parties


     March 31, 2018      December 31, 2017  

Payables to third parties

     2,975,297        3,080,569  
  

 

 

    

 

 

 
     2,975,297        3,080,569  
  

 

 

    

 

 

 
Payables to third parties

 

     December 31,  
     2017      2016  

Payables to third parties

     3,080,569        1,304,031  
  

 

 

    

 

 

 
     3,080,569        1,304,031