Note 2 - Summary of Significant Accounting Policies - Stock-based Compensation Costs (Details) - USD ($)	12 Months Ended
Sep. 29, 2018	Sep. 30, 2017
Total stock-based compensation expense before taxes	$ 30,292	$ 14,996
Selling, General and Administrative Expenses [Member]
Total stock-based compensation expense before taxes	24,939	13,910
Product Development Expenses [Member]
Total stock-based compensation expense before taxes	$ 5,353	$ 1,086

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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