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Note 6 - Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Goodwill [Table Text Block]
    December 31,
    2019   2018
    (in thousands)
Carrying amount at beginning of year   $
57,304
     $
36,336
  
Goodwill arising from business combination    
-
      
21,865
  
Effect of change in currency translation    
77
      
(897
 )
Carrying amount at end of year   $
57,381
     $
57,304
  
Schedule of Intangible Assets and Goodwill [Table Text Block]
        December 31,
        2019   2018
        (in thousands)
Amortizable intangible assets:  
Weighted Average
Life* (Years)
   Gross   Accumulated Amortization   Net   Gross   Accumulated Amortization   Net
Distribution agreements/customer relationships    
9.8
     $
17,891
     $
(6,340
 )   $
11,551
     $
22,657
     $
(9,509
 )   $
13,148
  
Existing technology    
6.1
      
41,222
      
(19,698
 )    
21,524
      
41,268
      
(16,215
 )    
25,053
  
Trade names    
6.8
      
7,692
      
(3,497
 )    
4,195
      
7,828
      
(2,861
 )    
4,967
  
In-process R&D    
-
      
-
      
-
      
-
      
1,387
      
(30
 )    
1,357
  
Patents    
-
      
218
      
(218
 )    
-
      
211
      
(204
 )    
7
  
Total amortizable intangible assets    
 
     $
67,023
     $
(29,753
 )   $
37,270
     $
73,351
     $
(28,819
 )   $
44,532
  
Indefinite-lived intangible assets:    
 
      
 
      
 
      
1,135
      
 
      
 
      
1,232
  
Total intangible assets    
 
      
 
      
 
     $
38,405
      
 
      
 
     $
45,764