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10. Financial instruments (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of detailed information about financial instruments [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, 2019                
 Assets                 
Trade receivables          12,460,070                         -                         -          12,460,070
Other receivables               315,492                         -                     224               315,716
Cash and cash equivalents                
     Cash and Banks               159,942                         -                         -               159,942
     Money market funds                         -               249,700                         -               249,700
Financial assets at fair value through profit or loss:                
     Money market funds                         -            2,789,831                         -            2,789,831
 Total          12,935,504            3,039,531                     224          15,975,259
                 
                 
 As of December 31, 2018                
 Assets                 
Trade receivables          11,667,923                         -                         -          11,667,923
Other receivables            1,464,977                         -               136,011            1,600,988
Cash and cash equivalents                             -                         -    
     Cash and Banks                 42,453                         -                         -                 42,453
Financial assets at fair value through profit or loss:                
     Government bonds                         -            5,052,573                         -            5,052,573
     Money market funds                         -               147,236                         -               147,236
Financial assets at fair value                
     Time deposits            1,858,726                         -                         -            1,858,726
 Total          15,034,079            5,199,809               136,011          20,369,899

 

     Financial liabilities at amortized cost    Financial liabilities at fair value through profit or loss    Non-financial liabilities    Total
 As of December 31, 2019                
 Liabilities                
 Trade payables          13,070,359                         -                         -          13,070,359
 Other payables            7,616,248                         -                         -            7,616,248
 Borrowings            9,856,665                         -                         -            9,856,665
 Total           30,543,272                         -                         -          30,543,272
                 
 As of December 31, 2018                
 Liabilities                
 Trade payables          22,904,340                         -                         -          22,904,340
 Other payables               488,126                         -          14,191,041          14,679,167
 Borrowings          12,716,656                         -                         -          12,716,656
 Total           36,109,122                         -          14,191,041          50,300,163

  
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, 2019            
Interest income            1,208,970                         -            1,208,970
Exchange differences               608,847            1,069,587            1,678,434
Changes in fair value of financial assets                         -               281,039               281,039
Corporate Notes               456,884                         -               456,884
Total            2,274,701            1,350,626            3,625,327
             
 As of December 31, 2018            
Interest income            1,033,000                         -            1,033,000
Exchange differences            3,637,573                         -            3,637,573
Bank fees and expenses               (13,084)                         -               (13,084)
Changes in fair value of financial assets                         -            1,147,943            1,147,943
Adjustment to present value                   (503)                         -                   (503)
Total            4,656,986            1,147,943            5,804,929
             
             
As of December 31, 2017            
Interest income               697,814                         -               697,814
Exchange differences               352,287                         -               352,287
Bank fees and expenses                (4,433)                         -                (4,433)
Changes in fair value of financial assets                         -               730,248               730,248
Adjustment to present value                   (663)                         -                   (663)
Total            1,045,005               730,248            1,775,253

  

     Financial liabilities at amortized cost    Financial liabilities at fair value through profit or loss    Total
 As of December 31, 2019            
Interest expense          (6,739,597)                         -          (6,739,597)
Exchange differences          (5,846,670)                         -          (5,846,670)
Other financial results               (16,299)                         -               (16,299)
 Total         (12,602,566)                         -        (12,602,566)
             
 As of December 31, 2018            
Interest expense          (7,639,617)                         -          (7,639,617)
Other financial results             (132,393)                         -             (132,393)
Exchange differences          (8,451,756)                         -          (8,451,756)
 Total         (16,223,766)                         -        (16,223,766)
             
 As of December 31, 2017            
Interest expense          (3,947,849)                         -          (3,947,849)
Other financial results             (121,289)                         -             (121,289)
Exchange differences          (1,219,638)                         -          (1,219,638)
 Total           (5,288,776)                         -          (5,288,776)

 
Credit quality of financial assets
     12.31.19    12.31.18
 Customers with no external credit rating:        
 Group 1  (i)            10,560,628            9,900,482
 Group 2 (ii)                 529,945               738,460
 Group 3 (iii)              1,369,497            1,028,981
 Total trade receivables           12,460,070          11,667,923

 

                   (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.