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Note 10 - Property, Plant and Equipment, Net (Tables)
 12 Months Ended
Dec. 31, 2017
Statement Line Items [Line Items]  
Disclosure of detailed information about property, plant and equipment [text block]
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
  
Year ended December 31, 2016   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    
609,190
      
9,683,181
      
340,835
      
1,219,369
      
18,330
      
11,870,905
  
Translation differences    
2,601
      
6,737
      
2,445
      
2,644
      
53
      
14,480
  
Additions    
639
      
1,384
      
784
      
750,038
      
4,650
      
757,495
  
Disposals / Consumptions    
(2,296
 )    
(26,073
 )    
(10,751
 )    
(4,850
 )    
(2,494
 )    
(46,464
 )
Transfer to assets held for sale    
(34,849
 )    
(61,380
 )    
(1,103
 )    
(1,407
 )    
(177
 )    
(98,916
 )
Transfers / Reclassifications    
24,425
      
430,651
      
14,276
      
(473,222
 )    
5,042
      
1,172
  
Values at the end of the year    
599,710
      
10,034,500
      
346,486
      
1,492,572
      
25,404
      
12,498,672
  
                                                 
Depreciation                                                
Accumulated at the beginning of the year    
88,270
      
5,844,657
      
265,487
      
-
      
231
      
6,198,645
  
Translation differences    
508
      
(3,318
 )    
1,831
      
-
      
(20
 )    
(999
 )
Depreciation charge    
9,621
      
359,516
      
24,260
      
-
      
533
      
393,930
  
Transfers / Reclassifications    
(160
 )    
(3,328
 )    
-
      
-
      
(744
 )    
(4,232
 )
Transfer to assets held for sale    
(8,552
 )    
(47,928
 )    
(966
 )    
-
      
-
      
(57,446
 )
Disposals / Consumptions    
(413
 )    
(24,047
 )    
(8,705
 )    
-
      
-
      
(33,165
 )
Accumulated at the end of the year    
89,274
      
6,125,552
      
281,907
      
-
      
-
      
6,496,733
  
At December 31, 2016    
510,436
      
3,908,948
      
64,579
      
1,492,572
      
25,404
      
6,001,939