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Note 1 - Basis of Presentation (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
   
Three Months Ended
   
Twelve Months Ended
 
(in thousands)
 
Dec. 31, 2017
   
Sept. 30 2017
   
June 30, 2017
   
Mar. 31, 2017
   
Dec. 31, 2017
 
R
evenue
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Services
  $
166
    $
162
    $
159
    $
149
    $
636
 
Products
   
(166
)    
(162
)    
(159
)    
(149
)    
(636
)
Total net revenue
   
     
     
     
     
 
Cost of Revenue
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Services
   
62
     
51
     
50
     
46
     
209
 
Products
   
(62
)    
(51
)    
(50
)    
(46
)    
(209
)
Total cost of revenue
   
     
     
     
     
 
Net Income
  $
    $
    $
    $
    $