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Note 14 - Business Segment Information (Tables)
12 Months Ended
Sep. 28, 2019
Notes Tables  
Schedule of Revenue and Long-lived Assets by Geographic Area [Table Text Block]
   
Year Ended
 
   
September 28,
   
September 29,
   
September 30,
 
(In thousands)
 
2019
   
2018
   
2017
 
Net sales:
                       
United States
  $
454,373
    $
451,418
    $
387,199
 
Foreign
   
1,340
     
1,799
     
1,672
 
Total
  $
455,713
    $
453,217
    $
388,871
 
                         
Long-lived assets:
                       
United States
  $
132,074
    $
133,913
    $
122,574
 
Foreign
   
-
     
-
     
-
 
Total
  $
132,074
    $
133,913
    $
122,574
 
Revenue from External Customers by Products and Services [Table Text Block]
   
Year Ended
 
   
September 28,
   
September 29,
   
September 30,
 
(In thousands)
 
2019
   
2018
   
2017
 
Net sales:
                       
Welded wire reinforcement
  $
290,423
    $
273,658
    $
239,522
 
Prestressed concrete strand
   
165,290
     
179,559
     
149,349
 
Total
  $
455,713
    $
453,217
    $
388,871