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Note 8 - Product Warranties (Tables)
 6 Months Ended
Apr. 01, 2017
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
Six Months Ended
  
   
April 1,
    
April 2,
  
   
2017
    
2016
  
Accrued liability at beginning of period
   $
306,488
    $
291,980
 
Increase in reserve
    
83,629
     
144,857
 
Repairs and replacements
    
(77,370
 )    
(122,763
 )
Accrued liability at end of period
   $
312,747
    $
314,074