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Schedule III - Supplemental Financial Information (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Quarterly Financial Information [Table Text Block]
201
7
  
1st quarte
r
    
2nd quarte
r
    
3rd quarte
r
    
4th quarte
r
    
Yea
r
  
Net sale
s
   $
334,893
     $
356,195
     $
331,442
     $
308,166
     $
1,330,696
  
Operating income (loss) (a
)
    
11,051
      
9,633
      
5,286
      
(1,984
 )    
23,986
  
Income (loss) before income taxe
s
    
9,399
      
7,817
      
3,298
      
(4,164
 )    
16,350
  
Net income (b
)
   $
7,699
     $
4,797
     $
2,280
     $
4,187
     $
18,963
  
Basic net income (loss) per shar
e
   $
0.68
     $
0.42
     $
0.20
     $
0.37
     $
1.67
  
Weighted average shares outstanding - basi
c
    
11,369
      
11,383
      
11,386
      
11,389
      
11,381
  
Diluted net income (loss) per shar
e
   $
0.68
     $
0.42
     $
0.20
     $
0.37
     $
1.67
  
Weighted average shares outstanding - dilute
d
    
11,369
      
11,390
      
11,386
      
11,391
      
11,381
  
Market price of common stock: (c
)
                                        
Hig
h
   $
27.93
     $
24.00
     $
22.44
     $
22.86
     $
27.93
  
Lo
w
    
18.05
      
15.83
      
16.58
      
18.10
      
15.83
  
201
6
  
1st quarte
r
    
2nd quarte
r
    
3rd quarte
r
    
4th quarte
r
    
Yea
r
  
Net sale
s
   $
258,349
     $
273,608
     $
268,255
     $
254,904
     $
1,055,116
  
Operating income (loss) (d
)
    
35
      
8,339
      
27
      
(2,653
 )    
5,748
  
Income (loss) before income taxe
s
    
(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 shar
e
   $
(0.07
 )   $
0.32
     $
(0.16
 )   $
(0.19
 )   $
(0.10
 )
Weighted average shares outstanding - basi
c
    
11,182
      
11,216
      
11,219
      
11,221
      
11,210
  
Diluted net income (loss) per shar
e
   $
(0.07
 )   $
0.32
     $
(0.16
 )   $
(0.19
 )   $
(0.10
 )
Weighted average shares outstanding - dilute
d
    
11,182
      
11,216
      
11,219
      
11,221
      
11,210
  
Market price of common stock: (c
)
                                        
Hig
h
   $
17.50
     $
27.48
     $
31.19
     $
28.67
     $
31.19
  
Lo
w
    
7.98
      
15.41
      
17.42
      
17.14
      
7.98