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Note 3 - Business Combinations, Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
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)
    
2017
    
2016
  
Tradename
    
5
to
7
     $
555
     $
555
  
Patents and technological know-how
    
 
10
 
      
8,578
      
6,010
  
Proprietary software
    
3
to
15
      
2,981
      
4,341
  
Other
    
3
to
5
      
323
      
324
  
Total intangible assets, gross    
 
 
 
      
12,437
      
11,230
  
Accumulated amortization
      
(5,894
)
    
(5,553
)
Total intangible assets, net
     $
6,543
     $
5,677
  
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Years ending December 31,
  
 
 
 
2018
   $
935
  
2019
    
831
  
2020
    
652
  
2021
    
652
  
2022
    
652
  
Thereafter
    
2,821
  
Total   $
6,543