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Note 9 - Property, Plant and Equipment, Net (Tables)
 12 Months Ended
Dec. 31, 2018
Statement Line Items [Line Items]  
Disclosure of detailed information about property, plant and equipment [text block]
Year ended December 31, 2018   Land and civil buildings     Industrial buildings, plant and production equipment     Vehicles, furniture and fixtures     Work in progress     Spare parts and equipment     Total  
                                     
Cost                                                
Values at the beginning of the year    
712,061
      
11,954,585
      
370,542
      
167,079
      
42,413
      
13,246,680
  
Translation differences    
(5,628
 )    
(117,977
 )    
(5,458
 )    
(2,269
 )    
(424
 )    
(131,756
 )
Additions    
723
      
681
      
1,245
      
294,163
      
20,756
      
317,568
  
Disposals / Consumptions    
(221
 )    
(21,836
 )    
(10,269
 )    
(42
 )    
(3,541
 )    
(35,909
 )
Transfers / Reclassifications    
25,643
      
306,116
      
21,200
      
(331,553
 )    
3,993
      
25,399
  
Values at the end of the year    
732,578
      
12,121,569
      
377,260
      
127,378
      
63,197
      
13,421,982
  
Depreciation                                                
Accumulated at the beginning of the year    
101,197
      
6,612,871
      
303,469
      
-
      
-
      
7,017,537
  
Translation differences    
(1,383
 )    
(72,141
 )    
(4,939
 )    
-
      
-
      
(78,463
 )
Depreciation charge    
11,153
      
417,229
      
21,083
      
-
      
-
      
449,465
  
Transfers / Reclassifications    
-
      
173
      
(671
 )    
-
      
-
      
(498
 )
Disposals / Consumptions    
(53
 )    
(21,232
 )    
(8,682
 )    
-
      
-
      
(29,967
 )
Accumulated at the end of the year    
110,914
      
6,936,900
      
310,260
      
-
      
-
      
7,358,074
  
At December 31, 2018    
621,664
      
5,184,669
      
67,000
      
127,378
      
63,197
      
6,063,908
  
Year ended December 31, 2017   Land and civil buildings     Industrial buildings, plant and production equipment     Vehicles, furniture and fixtures     Work in progress     Spare parts and equipment     Total  
                                     
Cost                                                
Values at the beginning of the year    
599,710
      
10,034,500
      
346,486
      
1,492,572
      
25,404
      
12,498,672
  
Translation differences    
5,493
      
178,598
      
5,518
      
284
      
331
      
190,224
  
Additions    
63
      
7,423
      
1,252
      
497,423
      
18,490
      
524,651
  
Disposals / Consumptions    
(1,293
 )    
(3,966
 )    
(7,319
 )    
(94
 )    
(1,812
 )    
(14,484
 )
Increase due to business combinations (*)    
2,187
      
5,654
      
2,444
      
-
      
-
      
10,285
  
Transfers / Reclassifications    
105,901
      
1,732,376
      
22,161
      
(1,823,106
 )    
-
      
37,332
  
Values at the end of the year    
712,061
      
11,954,585
      
370,542
      
167,079
      
42,413
      
13,246,680
  
Depreciation                                                
Accumulated at the beginning of the year    
89,274
      
6,125,552
      
281,907
      
-
      
-
      
6,496,733
  
Translation differences    
1,204
      
114,675
      
4,959
      
-
      
-
      
120,838
  
Depreciation charge    
9,406
      
368,850
      
23,213
      
-
      
-
      
401,469
  
Transfers / Reclassifications    
1,699
      
7,575
      
(405
 )    
-
      
-
      
8,869
  
Disposals / Consumptions    
(386
 )    
(3,781
 )    
(6,205
 )    
-
      
-
      
(10,372
 )
Accumulated at the end of the year    
101,197
      
6,612,871
      
303,469
      
-
      
-
      
7,017,537
  
At December 31, 2017    
610,864
      
5,341,714
      
67,073
      
167,079
      
42,413
      
6,229,143