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Note 9 - Goodwill (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Goodwill [Table Text Block]
    Americas     EMEA     Asia
Pacific		     Investment
Management		     Consolidated  
                               
Balance, December 31, 2016   $
126,417
     $
165,110
     $
44,446
     $
12,033
     $
348,006
  
Goodwill acquired during the year    
62,938
      
13,672
      
1,961
      
-
      
78,571
  
Other items    
1,175
      
-
      
-
      
-
      
1,175
  
Foreign exchange    
48
      
22,397
      
3,259
      
1,674
      
27,378
  
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    
234,070
      
257,064
      
46,931
      
379,412
      
917,477
  
Accumulated impairment loss    
(26,271
 )    
(3,312
 )    
-
      
-
      
(29,583
 )
    $
207,799
     $
253,752
     $
46,931
     $
379,412
     $
887,894