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10. Financial instruments (Tables)
 12 Months Ended
Dec. 31, 2018
Financial Instruments Tables Abstract  
Financial instruments by category
     Financial assets at amortized cost     Financial assets at fair value through profit or loss     Non-financial assets     Total 
 As of December 31, 2018                 
 Assets                  
Trade receivables                   7,587,906                                 -                                 -                   7,587,906
Other receivables                      954,407                                 -                        88,451                   1,042,858
Cash and cash equivalents                 
     Cash and Banks                        27,608                                 -                                 -                        27,608
Financial assets at fair value through profit or loss:                
     Government bonds                                 -                   3,285,799                                 -                   3,285,799
     Derivative financial instruments                                 -                                 -                                 -                                 -
     Money market funds                                 -                        95,751                                 -                        95,751
Financial assets at amortized cost:                
     Time deposits                   1,208,770                                 -                                 -                   1,208,770
 Total                    9,778,691                   3,381,550                        88,451                 13,248,692
                 
                 
 As of December 31, 2017                 
 Assets                  
Trade receivables                   8,385,237                                 -                                 -                   8,385,237
Other receivables                      249,780                        88,667                        20,448                      358,895
Cash and cash equivalents                                      -                                 -    
     Cash and Banks                      120,053                                 -                                 -                      120,053
     Checks to be deposited                          2,296                                 -                                 -                          2,296
     Money market funds                
Financial assets at fair value through profit or loss:                
     Government bonds                                 -                   1,829,888                                 -                   1,829,888
     Derivative financial instruments                                 -                   2,448,120                                 -                   2,448,120
Financial assets at fair value                
     Government bonds                        16,978                                 -                                 -                        16,978
 Total                    8,774,344                   4,366,675                        20,448                 13,161,467

 

     Financial liabilities at amortized cost     Financial liabilities at fair value through profit or loss     Non-financial liabilities     Total 
 As of December 31, 2018                 
 Liabilities                 
 Trade payables                  14,895,194                                 -                                 -                 14,895,194
 Other payables                       317,439                                 -                   9,228,745                   9,546,184
 Borrowings                    8,269,920                                 -                                 -                   8,269,920
 Total                   23,482,553                                 -                   9,228,745                 32,711,298
                 
 As of December 31, 2017                 
 Liabilities                 
 Trade payables                  13,933,226                                 -                                 -                 13,933,226
 Other payables                       490,188                                 -                   8,966,695                   9,456,883
 Borrowings                    6,294,433                                 -                                 -                   6,294,433
 Total                   20,717,847                                 -                   8,966,695                 29,684,542

 
Income, expenses, gains and losses of financial instruments
     Financial assets at amortized cost     Financial assets at fair value through profit or loss     Total 
As of December 31, 2018            
Interest income                       671,783                                 -                      671,783
Exchange differences                   2,866,396                                 -                   2,866,396
Bank fees and expenses                       (8,509)                                 -                       (8,509)
Changes in fair value of financial assets                                 -                      746,532                      746,532
Adjustment to present value                           (327)                                 -                          (327)
Total                    3,529,343                      746,532                   4,275,875
             
As of December 31, 2017            
Interest income                       453,804                                 -                      453,804
Exchange differences                      229,100                                 -                      229,100
Bank fees and expenses                       (2,883)                                 -                       (2,883)
Changes in fair value of financial assets                                 -                      474,896                      474,896
Adjustment to present value                           (431)                                 -                          (431)
Total                       679,590                      474,896                   1,154,486
             
As of December 31, 2016            
Interest income                       362,558                                 -                      362,558
Exchange differences                      178,191                          5,830                      184,021
Bank fees and expenses                       (5,928)                                 -                       (5,928)
Changes in fair value of financial assets                                 -                      781,486                      781,486
Adjustment to present value                           (485)                          5,799                          5,314
Total                       534,336                      793,115                   1,327,451

  

     Financial liabilities at amortized cost     Financial liabilities at fair value through profit or loss     Total 
As of December 31, 2018            
Interest expense                (4,968,210)                                 -                (4,968,210)
Other financial results                     (86,098)                                 -                     (86,098)
Exchange differences                (5,496,362)                                 -                (5,496,362)
 Total                (10,550,670)                                 -              (10,550,670)
             
 As of December 31, 2017             
Interest expense                (2,567,373)                                 -                (2,567,373)
Other financial results                     (78,877)                                 -                     (78,877)
Exchange differences                   (793,157)                                 -                   (793,157)
 Total                  (3,439,407)                                 -                (3,439,407)
             
 As of December 31, 2016             
Interest expense                (2,656,550)                                 -                (2,656,550)
Other financial results                     (67,780)                                 -                     (67,780)
Bank fees and expenses                               77                                 -                               77
Exchange differences                   (953,730)                                 -                   (953,730)
 Total                  (3,677,983)                                 -                (3,677,983)

  
Credit quality of financial assets
     12.31.18     12.31.17 
 Customers with no external credit rating:         
 Group 1  (i)                      6,438,500                   7,487,484
 Group 2 (ii)                         480,237                      339,740
 Group 3 (iii)                         669,169                      558,013
 Total trade receivables                     7,587,906                   8,385,237
         
 (i)       Relates to customers with debt to become due         
 (ii)      Relates to customers with past due debt from 0 to 3 months.     
 (iii)     Relates to customers with past due debt from 3 to 12 months.