Note 3 - Business Combination - Restructuring Activity (Details) - USD ($) $ in Thousands	3 Months Ended					9 Months Ended
	Jul. 03, 2021	Apr. 03, 2021	Jan. 02, 2021	Jun. 27, 2020	Mar. 28, 2020	Jul. 03, 2021	Jun. 27, 2020
Liability balance	$ 27	$ 47	$ 171	$ 145		$ 171
Restructuring charges	1,598	545	657	808	$ 149	2,800	$ 957
Cash payments	(218)	(565)	(777)	(490)	(4)
Non-cash charges	(1,387)	0	(4)	(343)
Liability balance	20	27	47	120	145	20	120
Employee Severance [Member]
Liability balance	0	0	0	125		0
Restructuring charges	0	0	13	76	129
Cash payments	0	0	(13)	(124)	(4)
Non-cash charges	0	0	0	0
Liability balance	0	0	0	77	125	0	77
Equipment Relocation [Member]
Liability balance	0	13	20	0		20
Restructuring charges	35	286	88	16	0
Cash payments	(35)	(299)	(95)	(16)	0
Non-cash charges	0	0	0	0
Liability balance	0	0	13	0	0	0	0
Facility Closing [Member]
Liability balance	27	34	151	20		151
Restructuring charges	176	259	552	373	20
Cash payments	(183)	(266)	(669)	(350)	0
Non-cash charges	0	0	0	0
Liability balance	20	27	34	43	20	20	43
Asset Impairments [Member]
Liability balance	0	0	0	0		0
Restructuring charges	1,387	0	4	343	0
Cash payments	0	0	0	0	0
Non-cash charges	(1,387)	0	(4)	(343)
Liability balance	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0