Note 7 - Equipment and Leasehold Improvements - Schedule of Equipment and Leasehold Improvements (Details) - USD ($)	12 Months Ended
Sep. 24, 2022	Sep. 25, 2021
Equipment and leasehold improvements	$ 4,556,144	$ 4,543,183
Less accumulated depreciation and amortization	(4,544,778)	(4,538,782)
Equipment and leasehold improvements, net	11,366	4,401
Engineering and Manufacturing Equipment [Member]
Equipment and leasehold improvements	$ 2,162,241	$ 2,149,280
Engineering and Manufacturing Equipment [Member] \| Minimum [Member]
Property, plant, and equipment, useful life (Year)	3 years
Engineering and Manufacturing Equipment [Member] \| Maximum [Member]
Property, plant, and equipment, useful life (Year)		8 years
Demonstration Equipment [Member]
Equipment and leasehold improvements	$ 834,137	$ 834,137
Property, plant, and equipment, useful life (Year)		3 years
Furniture and Fixtures [Member]
Equipment and leasehold improvements	$ 1,015,816	$ 1,015,816
Furniture and Fixtures [Member] \| Minimum [Member]
Property, plant, and equipment, useful life (Year)	3 years
Furniture and Fixtures [Member] \| Maximum [Member]
Property, plant, and equipment, useful life (Year)		8 years
Vehicles [Member]
Equipment and leasehold improvements	$ 49,441	$ 49,441
Property, plant, and equipment, useful life (Year)		5 years
Leasehold Improvements [Member]
Equipment and leasehold improvements	$ 494,509	$ 494,509

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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