Note 7 - Equipment and Leasehold Improvements - Schedule of Equipment and Leasehold Improvements (Details) - USD ($)	12 Months Ended
Sep. 29, 2018	Sep. 30, 2017
Equipment and leasehold improvements	$ 4,578,501	$ 4,534,839
Less accumulated depreciation and amortization	(4,529,298)	(4,481,085)
Equipment and leasehold improvements, net	49,203	53,754
Engineering and Manufacturing Equipment [Member]
Equipment and leasehold improvements	$ 2,168,148	2,124,486
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	$ 845,541	845,541
Property, plant, and equipment, useful life (Year)	3 years
Furniture and Fixtures [Member]
Equipment and leasehold improvements	$ 1,020,862	1,020,862
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
Property, plant, and equipment, estimated useful lives	Lesser of useful life or term of lease

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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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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