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Note 3 - Business Combinations, Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]
   
Estimated
useful lives
   
As of December 31,
  
   
(in years)
    
201
8
    
201
7
  
Tradename
    
5
to
7
     $
555
     $
555
  
Patents and technological know-how
    
 
10
 
      
13,377
      
8,578
  
Proprietary software
    
3
to
15
      
2,981
      
2,981
  
Other
    
3
to
5
      
323
      
323
  
Total intangible assets, gross
    
 
 
 
      
17,236
      
12,437
  
Accumulated amortization
    
 
 
 
      
(6,987
)
    
(5,894
)
Total intangible assets, net
    
 
 
 
     $
10,249
     $
6,543
  
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Years ending December 31,
  
 
 
 
2019
   $
1,226
  
2020
    
1,048
  
2021
    
1,048
  
2022
    
1,048
  
2023
    
866
  
Thereafter
    
5,013
  
Total
   $
10,249