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Note 9 - Goodwill (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Goodwill [Table Text Block]
      Americas       EMEA       Asia
Pacific		       Consolidated  
                 
Balance, December 31, 2015   $
106,797
      
154,356
      
44,527
      
305,680
  
Goodwill acquired during the year    
19,665
      
33,289
      
-
      
52,954
  
Other items    
(603
 )    
(266
 )    
-
      
(869
 )
Foreign exchange    
558
      
(10,236
 )    
(81
 )    
(9,759
 )
Balance, December 31, 2016    
126,417
      
177,143
      
44,446
      
348,006
  
Goodwill acquired during the year    
62,938
      
13,672
      
1,961
      
78,571
  
Other items    
1,175
      
-
      
-
      
1,175
  
Foreign exchange    
48
      
24,071
      
3,259
      
27,378
  
Balance, December 31, 2017    
190,578
      
214,886
      
49,666
      
455,130
  
Goodwill    
216,849
      
218,198
      
49,666
      
484,713
  
Accumulated impairment loss    
(26,271
 )    
(3,312
 )    
-
      
(29,583
 )
    $
190,578
     $
214,886
     $
49,666
     $
455,130