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Note 4 - Revenue (Tables)
3 Months Ended
Dec. 26, 2020
Notes Tables  
Disaggregation of Revenue [Table Text Block]
    2021   2020
         
Engineering services   $
-
    $
408,824
 
Equipment sales    
166,925
     
257,101
 
Total   $
166,925
    $
665,925