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Note 5 - Property and Equipment, Net (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
December 31,
  
   
2018
    
2017
  
Computer software
   $
124
     $
248
  
Computer equipment
    
197
      
717
  
Machinery and equipment
    
1,784
      
3,351
  
Furniture and fixture
    
78
      
517
  
Leasehold improvements
    
326
      
638
  
Equipment held by customers
    
2,718
      
2,997
  
     
5,227
      
8,468
  
Less: Accumulated depreciation and amortization
    
(3,155
)
    
(5,564
)
Add: Construction-in-progress
    
6
      
46
  
    $
2,078
     $
2,950