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Note 12 - Goodwill (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Goodwill [Table Text Block]
                     
Asia
      
Investment
          
     
Americas
      
EMEA
      
Pacific
      
Management
      
Consolidated
  
                                         
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 acquired during the year    
117,984
      
-
      
-
      
-
      
117,984
  
Other items    
-
      
-
      
150
      
-
      
150
  
Foreign exchange    
(667
 )    
18,213
      
2,942
      
1,141
      
21,629
  
Balance, December 31, 2020    
337,727
      
275,546
      
95,419
      
380,292
      
1,088,984
  
Goodwill    
363,998
      
278,858
      
95,419
      
380,292
      
1,118,567
  
Accumulated impairment loss    
(26,271
 )    
(3,312
 )    
-
      
-
      
(29,583
 )
    $
337,727
     $
275,546
     $
95,419
     $
380,292
     $
1,088,984