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Note P - Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Fiscal Year Ended September 30, 2017
  
   
(in thousands)
  
                         
   
 
 
 
  
Unrealized
    
 
 
 
   
Foreign Currency
    
Holding (Loss) Gain
   
 
 
 
   
Translation
    
on Marketable
    
 
 
 
   
Adjustments
    
Securities
    
Total
  
                         
Beginning Balance
   $
(13,086
 )   $
(329
 )   $
(13,415
 )
                         
Other comprehensive loss before reclassifications
    
3,745
      
795
      
4,540
  
                         
Amounts reclassified from
accumulated other
comprehensive income
    
-
      
-
      
-
  
                         
Ending Balance
   $
(9,341
 )   $
466
     $
(8,875
 )
   
Fiscal Year Ended September 24, 2016
  
   
(in thousands)
 
 
 
 
 
 
 
 
                         
   
 
 
 
  
Unrealized
    
 
 
 
   
Foreign Currency
    
Holding Loss on
    
 
 
 
   
Translation
    
Marketable
    
 
 
 
   
Adjustments
    
Securities
    
Total
  
                         
Beginning Balance
   $
(10,021
 )   $
(876
 )   $
(10,897
 )
                         
Other comprehensive loss before reclassifications
    
(3,065
 )    
(8
 )    
(3,073
 )
                         
Amounts reclassified from accumulated other comprehensive income
    
-
      
555
      
555
  
                         
Ending Balance
   $
(13,086
 )   $
(329
 )   $
(13,415
 )