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Note 5 - Property and Equipment, Net (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
December 31,
  
   
201
9
    
201
8
  
Computer software
   $
122
     $
124
  
Computer equipment
    
144
      
197
  
Machinery and equipment
    
1,878
      
1,784
  
Furniture and fixture
    
78
      
78
  
Leasehold improvements
    
311
      
326
  
Equipment held by customers
    
3,076
      
2,718
  
     
5,609
      
5,227
  
Less: Accumulated depreciation and amortization
    
(3,948
)
    
(3,155
)
Add: Construction-in-progress
    
—
      
6
  
    $
1,661
     $
2,078