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Schedule III - Supplemental Financial Information (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Quarterly Financial Information [Table Text Block]
2016
  
1st
    
2nd
    
3rd
    
4th
    
Year
  
Net sales
   $
258,349
    $
273,608
    $
268,255
    $
254,904
    $
1,055,116
 
Operating income (loss) (a)
    
35
     
8,339
     
27
     
(2,653
 )    
5,748
 
Income (loss) before income taxes
    
(1,255
 )    
7,007
     
(1,288
 )    
(4,044
 )    
420
 
Net income (loss)
   $
(767
 )   $
3,550
    $
(1,757
 )   $
(2,104
 )   $
(1,078
 )
Basic net income (loss) per share
   $
(0.07
 )   $
0.32
    $
(0.16
 )   $
(0.19
 )   $
(0.10
 )
Weighted average shares outstanding - basic
    
11,182
     
11,216
     
11,219
     
11,221
     
11,210
 
Diluted net income (loss) per share
   $
(0.07
 )   $
0.32
    $
(0.16
 )   $
(0.19
 )   $
(0.10
 )
Weighted average shares outstanding - diluted
    
11,182
     
11,216
     
11,219
     
11,221
     
11,210
 
Market price of common stock: (c)
                                        
High
   $
17.50
    $
27.48
    $
31.19
    $
28.67
    $
31.19
 
Low
    
7.98
     
15.41
     
17.42
     
17.14
     
7.98
 
2015
  
1st
    
2nd
    
3rd
    
4th
    
Year
  
Net sales
   $
345,865
    $
315,251
    $
276,922
    $
237,505
    $
1,175,543
 
Operating income (loss) (b)
    
3,345
     
(24,398
 )    
453
     
(7,179
 )    
(27,779
 )
Income (loss) before income taxes
    
1,751
     
(25,895
 )    
(1,036
 )    
(8,414
 )    
(33,594
 )
Net income (loss)
   $
1,069
    $
(22,260
 )   $
(598
 )   $
(4,988
 )   $
(26,777
 )
Basic net income (loss) per share
   $
0.10
    $
(1.99
 )   $
(0.05
 )   $
(0.45
 )   $
(2.39
 )
Weighted average shares outstanding - basic
    
11,195
     
11,201
     
11,203
     
11,173
     
11,192
 
Diluted net income (loss) per share
   $
0.10
    $
(1.99
 )   $
(0.05
 )   $
(0.45
 )   $
(2.39
 )
Weighted average shares outstanding - diluted
    
11,195
     
11,201
     
11,203
     
11,173
     
11,192
 
Market price of common stock: (c)
                                        
High
   $
18.57
    $
20.93
    $
17.92
    $
12.60
    $
20.93
 
Low
    
12.86
     
10.44
     
6.40
     
8.98
     
6.40