Note 4 - Revenue - Disaggreagation of Revenue (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 24, 2023	Jun. 25, 2022	Jun. 24, 2023	Jun. 25, 2022
Net revenue	$ 34,972	$ 146,089	$ 184,293	$ 1,134,682
Engineering Services [Member]
Net revenue	13,830	123,526	30,204	980,659
Equipment Sales [Member]
Net revenue	$ 21,142	$ 22,563	$ 154,089	$ 154,023