Note 2 - Summary of Significant Accounting Policies and Significant Judgments and Estimates - Stock-based Compensation Costs (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Total stock-based compensation expense before taxes	$ 25,496	$ 7,952	$ 43,080	$ 18,416
Selling, General and Administrative Expenses [Member]
Total stock-based compensation expense before taxes	24,461	7,596	39,644	17,352
Product Development Expenses [Member]
Total stock-based compensation expense before taxes	$ 1,035	$ 356	$ 3,436	$ 1,064