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Note 11 - Goodwill (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Goodwill [Table Text Block]
                Asia     Investment        
    Americas     EMEA     Pacific     Management     Consolidated  
                               
Balance, December 31, 2017   $
190,578
      
201,179
      
49,666
      
13,707
     $
455,130
  
Goodwill acquired during the year    
18,014
      
79,364
      
1,954
      
366,350
      
465,682
  
Goodwill disposed during the year    
-
      
(12,557
 )    
-
      
-
      
(12,557
 )
Other items    
44
      
-
      
-
      
-
      
44
  
Foreign exchange    
(837
 )    
(14,234
 )    
(4,689
 )    
(645
 )    
(20,405
 )
Balance, December 31, 2018    
207,799
      
253,752
      
46,931
      
379,412
      
887,894
  
Goodwill acquired during the year    
11,970
      
846
      
45,405
      
-
      
58,221
  
Other items    
330
      
4,404
      
-
      
-
      
4,734
  
Foreign exchange    
311
      
(1,669
 )    
(9
 )    
(261
 )    
(1,628
 )
Balance, December 31, 2019    
220,410
      
257,333
      
92,327
      
379,151
      
949,221
  
Goodwill    
246,681
      
260,645
      
92,327
      
379,151
      
978,804
  
Accumulated impairment loss    
(26,271
 )    
(3,312
 )    
-
      
-
      
(29,583
 )
    $
220,410
     $
257,333
     $
92,327
     $
379,151
     $
949,221