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Note 5 - Goodwill (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Goodwill [Table Text Block]
   
Total
    
North America
    
Asia
    
Europe
  
                                 
Balance at January 1, 2019
                                
Goodwill, gross
   $
148,408
     $
63,364
     $
54,508
     $
30,536
  
Accumulated impairment charges
    
(128,591
 )    
(54,473
 )    
(54,508
 )    
(19,610
 )
Goodwill, net
    
19,817
      
8,891
      
-
      
10,926
  
                                 
Impairment charge (see Note 4)
    
(8,891
 )    
(8,891
 )    
-
      
-
  
Foreign currency translation
    
(122
 )    
-
      
-
      
(122
 )
Measurement period adjustment    
(26
 )    
-
      
-
      
(26
 )
                                 
Balance at September 30, 2019:
                                
Goodwill, gross
    
148,260
      
63,364
      
54,508
      
30,388
  
Accumulated impairment charges
    
(137,482
 )    
(63,364
 )    
(54,508
 )    
(19,610
 )
Goodwill, net
   $
10,778
     $
-
     $
-
     $
10,778