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Note 10 - Goodwill (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Goodwill [Table Text Block]
    Americas   EMEA   Asia
Pacific		   Consolidated
                 
Balance, December 31, 2014   $
69,820
      
167,304
      
48,997
      
286,121
  
Goodwill acquired during the year    
39,627
      
3,322
      
424
      
43,373
  
Goodwill disposed during the year    
-
      
(111
 )    
-
      
(111
 )
Foreign exchange    
(2,650
 )    
(16,159
 )    
(4,894
 )    
(23,703
 )
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    
152,688
      
180,455
      
44,446
      
377,589
  
Accumulated impairment loss    
(26,271
 )    
(3,312
 )    
-
      
(29,583
 )
    $
126,417
     $
177,143
     $
44,446
     $
348,006