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Note 4 - Goodwill and Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Goodwill [Table Text Block]
    March 31,
    2020
(in thousands)        
Balance at December 31, 2019   $
57,381
  
Effect of change in currency translation    
(589
 )
Balance at March 31, 2020   $
56,792
  
Schedule of Intangible Assets and Goodwill [Table Text Block]
        March 31, 2020   December 31, 2019
        (in thousands)
Intangible assets:   Weighted
Average Life*
(Years)		   Gross   Accumulated
Amortization		   Net   Gross   Accumulated
Amortization		   Net
Distribution agreements/customer relationships    
8.4
     $
17,685
     $
(6,550
 )   $
11,135
     $
17,891
     $
(6,340
 )   $
11,551
  
Existing technology    
5.5
      
40,923
      
(20,327
 )    
20,596
      
41,222
      
(19,698
 )    
21,524
  
Trade names    
5.3
      
8,511
      
(3,667
 )    
4,844
      
7,692
      
(3,497
 )    
4,195
  
Patents    
-
      
206
      
(206
 )    
-
      
218
      
(218
 )    
-
  
Indefinite-lived tradename    
NA
      
232
      
-
      
232
      
1,135
      
0
      
1,135
  
Total intangible assets    
 
     $
67,557
     $
(30,750
 )   $
36,807
     $
68,158
     $
(29,753
 )   $
38,405