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Note 3 - Revenue (Tables)
 9 Months Ended
Jun. 29, 2019
Notes Tables  
Disaggregation of Revenue [Table Text Block]
    June 29, 2019   June 30, 2018
    3 months   9 months   3 months   9 months
                 
Engineering services   $
952,603
     $
2,819,676
     $
758,670
     $
2,218,375
  
Equipment sales    
282,060
      
1,455,799
      
148,507
      
329,297
  
Total   $
1,234,663
     $
4,275,475
     $
907,177
     $
2,547,672