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Note 12 (Tables)
 6 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Three Months Ended March 31, 2018
            
Six Months Ended March 31, 2018
          
    (unaudited)                (unaudited)             
    (in thousands)                (in thousands)             
                                                 
     
 
    
Unrealized
      
 
      
 
    
Unrealized
      
 
  
   
Foreign
Currency
    
Holding Gain (Loss)
      
 
    
Foreign
Currency
    
Holding Gain (Loss)
      
 
  
   
Translation
    
on Marketable
      
 
    
Translation
    
on Marketable
      
 
  
   
Adjustments
    
Securities
    
Total
    
Adjustments
    
Securities
    
Total
  
                                                 
Beginning Balance
   $
(13,228
 )   $
356
     $
(12,872
 )   $
(9,341
 )   $
466
     $
(8,875
 )
                                                 
Other comprehensive income (loss) before reclassifications
    
1,898
      
(184
 )    
1,714
      
(1,989
 )    
(294
 )    
(2,283
 )
                                                 
Amounts reclassified from accumulated other comprehensive income
    
-
      
-
      
-
      
-
      
-
      
-
  
                                                 
Ending Balance
   $
(11,330
 )   $
172
     $
(11,158
 )   $
(11,330
 )   $
172
     $
(11,158
 )
   
Three Months Ended March 25, 2017
            
Six Months Ended March 25, 2017
          
    (unaudited)                (unaudited)             
    (in thousands)                (in thousands)             
                                                 
     
 
    
Unrealized
      
 
      
 
    
Unrealized
      
 
  
   
Foreign
Currency
    
Holding (Loss) Gain
      
 
    
Foreign
Currency
    
Holding (Loss) Gain
      
 
  
   
Translation
    
on Marketable
      
 
    
Translation
    
on Marketable
      
 
  
   
Adjustments
    
Securities
    
Total
    
Adjustments
    
Securities
    
Total
  
                                                 
Beginning Balance
   $
(14,190
 )   $
(432
 )   $
(14,622
 )   $
(13,086
 )   $
(329
 )   $
(13,415
 )
                                                 
Other comprehensive income before reclassifications
    
1,894
      
598
      
2,492
      
790
      
495
      
1,285
  
                                                 
Amounts reclassified from accumulated other comprehensive income
    
-
      
-
      
-
      
-
      
-
      
-
  
                                                 
Ending Balance
   $
(12,296
 )   $
166
     $
(12,130
 )   $
(12,296
 )   $
166
     $
(12,130
 )