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Note 7 - Intangible Assets (Tables)
 12 Months Ended
Sep. 28, 2019
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
(In thousands)
  
Weighted-
Average Useful
Life (Years)
    
Gross
    
Accumulated Amortization
    
Net Book Value
  
As of September 28, 2019:
                              
Customer relationships
  
16.9
     $
9,070
     $
(2,207
 )   $
6,863
  
Developed technology and know-how  
20.0
      
1,800
      
(461
 )    
1,339
  
Non-competition agreements
  
5.0
      
1,800
      
(1,466
 )    
334
  
Trade name
  
4.0
      
140
      
(66
 )    
74
  
   
 
     $
12,810
     $
(4,200
 )   $
8,610
  
                               
As of September 29, 2018:
                              
Customer relationships
  
16.9
     $
9,070
     $
(1,598
 )   $
7,472
  
Developed technology and know-how  
20.0
      
1,800
      
(371
 )    
1,429
  
Non-competition agreements
  
5.0
      
3,687
      
(2,994
 )    
693
  
Trade name
  
4.0
      
140
      
(31
 )    
109
  
   
 
     $
14,697
     $
(4,994
 )   $
9,703