Note 12 - Major Customers and Export Revenue - Foreign Revenue (Details)	12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018
Mid-East and Africa [Member]
Foreign revenue by geographical area	70.50%	65.80%
SAUDI ARABIA
Foreign revenue by country	42.00%	46.00%
Far East [Member]
Foreign revenue by geographical area	29.20%	34.20%
PHILIPPINES
Foreign revenue by country	29.20%	34.20%
Europe [Member]
Foreign revenue by geographical area	0.30%
EGYPT
Foreign revenue by country	27.50%	14.80%
JORDAN
Foreign revenue by country		5.00%
Other Foreign Countries [Member]
Foreign revenue by country	1.30%