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Note 3 - Discontinued Operations (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Table Text Block]
   
December 31,
  
   
201
7
    
201
6
  
Asset
s
  
 
 
 
  
 
 
 
Inventorie
s
   $
-
     $
392
  
Property and equipment, ne
t
    
-
      
36,430
  
Total assets
   $
-
     $
36,822
  
Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Table Text Block]
   
Year Ended December 31,
  
   
201
7
    
201
6
    
201
5
  
                         
Net sales
   $
12
     $
6,869
     $
63,448
  
Cost of sales
    
1,792
      
9,777
      
76,679
  
Gross loss
    
(1,780
 )    
(2,908
 )    
(13,231
 )
Selling, general and administrative expense
    
(1
 )    
257
      
1,925
  
Gain on sale of facility
    
(6
 )    
-
      
-
  
Operating loss
    
(1,773
 )    
(3,165
 )    
(15,156
 )
Other income (expense)
    
-
      
(1
 )    
30
  
Interest income
    
-
      
-
      
172
  
Interest expense
    
-
      
(14
 )    
(50
 )
Loss before income taxes
    
(1,773
 )    
(3,180
 )    
(15,004
 )
Income tax benefit
    
(2
 )    
(658
 )    
(3,428
 )
Net loss
   $
(1,771
 )   $
(2,522
 )   $
(11,576
 )