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Note 4 - Inventories (Tables)
 6 Months Ended
Apr. 01, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
April 1,
    
October 1,
  
   
2017
    
2016
  
Raw materials
   $
5,845,272
    $
5,476,393
 
Work in process
    
397,188
     
678,753
 
Finished goods
    
1,642,315
     
1,807,296
 
Reserve for obsolescence
    
(514,000
 )    
(525,000
 )
Inventories, net
   $
7,370,775
    $
7,437,442