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Schedule III - Supplemental Financial Information (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Quarterly Financial Information [Table Text Block]
2019
  
1st quarter
    
2nd quarter
    
3rd quarter
    
4th quarter
    
Year
  
                                         
Net sales
   $
445,919
     $
429,151
     $
384,230
     $
319,740
     $
1,579,040
  
Operating income (a)
    
6,074
      
5,940
      
3,581
      
1,015
      
16,610
  
Income (loss) before income taxes
    
2,846
      
2,707
      
1,024
      
(1,288
 )    
5,289
  
Net income (loss)
   $
2,074
     $
2,081
     $
591
     $
(890
 )   $
3,856
  
Basic net income (loss) per share
   $
0.18
     $
0.18
     $
0.05
     $
(0.08
 )   $
0.34
  
Weighted average shares outstanding - basic
    
11,488
      
11,415
      
11,420
      
11,416
      
11,509
  
Diluted net income (loss) per share
   $
0.18
     $
0.18
     $
0.05
     $
(0.08
 )   $
0.34
  
Weighted average shares outstanding - diluted
    
11,488
      
11,415
      
11,420
      
11,416
      
11,509
  
                                         
Market price of common stock: (b)
                                        
High
   $
20.24
     $
18.24
     $
16.28
     $
18.41
     $
20.24
  
Low
    
14.00
      
12.09
      
9.99
      
13.53
      
9.99
  
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 (c)
    
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: (b)
                                        
High
   $
25.84
     $
24.27
     $
24.23
     $
21.41
     $
25.84
  
Low
    
19.75
      
19.75
      
19.92
      
13.72
      
13.72