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Note 3 - Asset Retirement Obligations (Tables)
 9 Months Ended
Jun. 29, 2018
Notes Tables  
Schedule of Change in Asset Retirement Obligation [Table Text Block]
   
Nine Months Ended
June 29, 2018
    
Twelve Months Ended
September 29, 2017
  
                 
ARO balance, beginning of period
   $
1,143
     $
1,369
  
Accretion expense
    
40
      
66
  
Settlement of ARO liability
    
(254
 )    
(310
 )
Foreign currency translation
    
(13
 )    
18
  
ARO balance, end of period
   $
916
     $
1,143