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Note 17 - Trade Receivables
 12 Months Ended
Dec. 31, 2017
Statement Line Items [Line Items]  
Disclosure of trade and other receivables [text block]
17
Trade receivables
    Year ended December 31,  
    2017     2016  
Current accounts    
1,240,769
      
1,026,026
  
Receivables from related parties    
51,676
      
14,383
  
     
1,292,445
      
1,040,409
  
Allowance for doubtful accounts (see Note 23 (i))    
(78,385
 )    
(85,724
 )
     
1,214,060
      
954,685
  
  
The following table sets forth details of the aging of trade receivables:
 
                Past due  
    Trade Receivables     Not Due     1 - 180 days     > 180 days  
At December 31, 2017                                
Guaranteed    
247,079
      
219,764
      
22,978
      
4,337
  
Not guaranteed    
1,045,366
      
841,737
      
115,245
      
88,384
  
Guaranteed and not guaranteed    
1,292,445
      
1,061,501
      
138,223
      
92,721
  
Allowance for doubtful accounts    
(78,385
 )    
-
      
-
      
(78,385
 )
Net Value    
1,214,060
      
1,061,501
      
138,223
      
14,336
  
                                 
At December 31, 2016                                
Guaranteed    
355,508
      
272,393
      
32,241
      
50,874
  
Not guaranteed    
684,901
      
518,984
      
87,379
      
78,538
  
Guaranteed and not guaranteed    
1,040,409
      
791,377
      
119,620
      
129,412
  
Allowance for doubtful accounts    
(85,724
 )    
(62
 )    
(67
 )    
(85,595
 )
Net Value    
954,685
      
791,315
      
119,553
      
43,817
  
 
Trade receivables are mainly denominated in
U.S. dollars.