Note 9 - Major Customers and Export Revenue - Foreign and Domestic Net Sales (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Total Revenue	$ 722,751	$ 1,928,468	$ 1,388,676	$ 3,040,813
Domestic [Member]
Total Revenue	495,838	1,821,788	988,047	2,844,465
Foreign [Member]
Total Revenue	$ 226,913	$ 106,680	$ 400,629	$ 196,348