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Note 4 - Revenue (Tables)
 6 Months Ended
Mar. 28, 2020
Notes Tables  
Disaggregation of Revenue [Table Text Block]
    March 28, 2020   March 30, 2019
    3 months   6 months   3 months   6 months
                 
Engineering services   $
457,818
     $
866,642
     $
877,080
     $
1,867,519
  
Equipment sales    
264,933
      
522,034
      
1,051,388
      
1,173,294
  
Total   $
722,751
     $
1,388,676
     $
1,928,468
     $
3,040,813