Note 5 - Major Customers and Export Sales - Foreign Revenue (Details)	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
SAUDI ARABIA
Foreign revenue by country	73.00%		44.00%	42.00%
Mid-East and Africa [Member]
Foreign revenue by geographical area	73.00%	100.00%	56.00%	89.00%
PHILIPPINES
Foreign revenue by country	27.00%		44.00%	4.00%
Far East [Member]
Foreign revenue by geographical area	27.00%		44.00%	11.00%
BAHRAIN
Foreign revenue by country		100.00%		4.00%
JORDAN
Foreign revenue by country			6.00%	43.00%
Other Foreign Countries [Member]
Foreign revenue by country			6.00%	7.00%