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Note 10 - Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Quarterly Financial Information [Table Text Block]
   
(in thousands, except per share data)
  
201
7
Quarters:
  
First
    
Second
    
Third
    
Fourth
  
Net Sales
  
$
11,190
    
$
11,615
    
$
10,427
    
$
11,946
 
Gross
profit
  
 
2,237
    
 
2,732
    
 
2,333
    
 
(2,466
)
                                 
Net
(
loss
) income
  
$
(416
)
  
$
14
    
$
(305
)
  
$
(7,002
)
(1)
                                 
 
Net loss per share
(2)
:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Basic
  
$
(.03
)
  
$
-
    
$
(.02
)
  
$
(.49
)
Diluted
  
$
(.03
)
  
$
-
    
$
(.02
)
  
$
(.49
)
2016 Quarters:
  
First
    
Second
    
Third
    
Fourth
  
Net Sales   $
11,683
     $
12,053
     $
11,036
     $
9,802
 
Gross profit    
2,541
      
2,062
      
1,835
      
1,976
 
                                 
Net loss
   $
(1,485
 )   $
(1,392
 )   $
(2,080
 )   $
(301
)
(1)
 
Net loss per share
(2:
                                
Basic
   $
(.10
 )   $
(.10
 )   $
(.15
 )   $
(.02
)
Diluted
   $
(.10
 )   $
(.10
 )   $
(.15
 )   $
(.02
)