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Schedule III - Supplemental Financial Information (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Quarterly Financial Information [Table Text Block]
2018
  
1st quarter
    
2nd quarter
    
3rd quarter
    
4th quarter
    
Year
  
Net sales
   $
375,598
     $
452,917
     $
456,976
     $
429,590
     $
1,715,081
  
Operating income (a)
    
12,345
      
24,319
      
18,614
      
1,774
      
57,052
  
Income (loss) before income taxes
    
10,313
      
21,556
      
15,708
      
(1,512
 )    
46,065
  
Net income (loss)
   $
7,629
     $
15,848
     $
11,599
     $
(1,316
 )   $
33,759
  
Basic net income (loss) per share
   $
0.67
     $
1.39
     $
1.01
     $
(0.11
 )   $
2.95
  
Weighted average shares outstanding - basic
    
11,418
      
11,435
      
11,444
      
11,444
      
11,432
  
Diluted net income (loss) per share
   $
0.67
     $
1.39
     $
1.01
     $
(0.11
 )   $
2.95
  
Weighted average shares outstanding - diluted
    
11,418
      
11,435
      
11,446
      
11,444
      
11,440
  
Market price of common stock: (c)
                                        
High
   $
25.84
     $
24.27
     $
24.23
     $
21.41
     $
25.84
  
Low
    
19.75
      
19.75
      
19.92
      
13.72
      
13.72
  
2017
  
1st quarter
    
2nd quarter
    
3rd quarter
    
4th quarter
    
Year
  
Net sales
   $
334,893
     $
356,195
     $
331,442
     $
308,166
     $
1,330,696
  
Operating income (loss) (d)
    
11,051
      
9,633
      
5,286
      
(1,984
 )    
23,986
  
Income (loss) before income taxes
    
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 per share
   $
0.68
     $
0.42
     $
0.20
     $
0.37
     $
1.67
  
Weighted average shares outstanding - basic
    
11,369
      
11,383
      
11,386
      
11,389
      
11,381
  
Diluted net income per share
   $
0.68
     $
0.42
     $
0.20
     $
0.37
     $
1.67
  
Weighted average shares outstanding - diluted
    
11,369
      
11,390
      
11,386
      
11,391
      
11,381
  
Market price of common stock: (c)
                                        
High
   $
27.93
     $
24.00
     $
22.44
     $
22.86
     $
27.93
  
Low
    
18.05
      
15.83
      
16.58
      
18.10
      
15.83