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Other disclosures on cash flows (Tables)
 12 Months Ended
Dec. 31, 2017
Other disclosures on cash flows (Tables) [Abstract]  
Non-cash investing and financing activities

Non-cash investing and financing activities

 

 

  

2017

 

  

2016

 

  

2015

 

Transfer of assets and liabilities

  

 

-  

 

  

 

56,351

 

  

 

399,048

 

Capitalization of related party transactions

  

 

-  

 

  

 

26,610

 

  

 

-