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Note 3 - Discontinued Operations (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Table Text Block]
   
Three Months Ended
September 30, 2017
   
Nine Months Ended
September 30, 2017
 
                 
Net sales
   $
-
     $
9
  
Cost of sales
    
457
      
1,469
  
Gross loss
    
(457
 )    
(1,460
 )
Selling, general and administrative expense
    
(1
 )    
(1
 )
Operating loss
    
(456
 )    
(1,459
 )
Interest expense
    
-
      
-
  
Loss before income taxes
    
(456
 )    
(1,459
 )
Income tax expense (benefit)
    
26
      
(4
 )
Net loss
   $
(482
 )   $
(1,455
 )