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Note 2 - Discontinued Operations (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Table Text Block]
   
Three Months
Ended June 30,
2017
   
Six Months
Ended June 30,
2017
 
                 
Net sales
   $
-
     $
9
  
Cost of sales
    
618
      
1,012
  
Gross loss
    
(618
 )    
(1,003
 )
Selling, general and administrative expense
    
-
      
-
  
Operating loss
    
(618
 )    
(1,003
 )
Interest expense
    
-
      
-
  
Loss before income taxes
    
(618
 )    
(1,003
 )
Income tax expense (benefit)
    
29
      
(30
 )
Net loss
   $
(647
 )   $
(973
 )