Note 9 - Major Customers and Export Revenue - Foreign Revenue (Details)	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
SAUDI ARABIA
Foreign revenue by country	99.00%	31.00%	99.00%	57.00%
Mid-East and Africa [Member]
Foreign revenue by geographical area	100.00%	100.00%	100.00%	95.00%
BAHRAIN
Foreign revenue by country	1.00%		1.00%
Far East [Member]
Foreign revenue by geographical area				5.00%
EGYPT
Foreign revenue by country		69.00%		38.00%
PHILIPPINES
Foreign revenue by country				5.00%