Note 3 - Restructuring - Restructuring Activity (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Apr. 02, 2022	Jan. 01, 2022	Apr. 03, 2021	Jan. 02, 2021	Apr. 02, 2022	Apr. 03, 2021
Liability balance	$ 4	$ 10	$ 47	$ 171	$ 10	$ 171
Restructuring charges		47	545	657
Cash payments	(261)	(53)	(565)	(777)
Non-cash charges	622	0	0	(4)
Restructuring charges (recoveries)	(365)		545		(318)	1,202
Liability balance	0	4	27	47	0	27
Employee Severance [Member]
Liability balance	0	0	0	0	0	0
Restructuring charges		0	0	13
Cash payments	0	0	0	(13)
Non-cash charges	0	0	0	0
Restructuring charges (recoveries)	0
Liability balance	0	0	0	0	0	0
Equipment Relocation [Member]
Liability balance	0	0	13	20	0	20
Restructuring charges		0	286	88
Cash payments	0	0	(299)	(95)
Non-cash charges	0	0	0	0
Restructuring charges (recoveries)	0
Liability balance	0	0	0	13	0	0
Facility Closing [Member]
Liability balance	4	10	34	151	10	151
Restructuring charges		47	259	552
Cash payments	(261)	(53)	(266)	(669)
Non-cash charges	0	0	0	0
Restructuring charges (recoveries)	257
Liability balance	0	4	27	34	0	27
Asset Impairments [Member]
Liability balance	0	0	0	0	0	0
Restructuring charges		0	0	4
Cash payments	0	0	0	0
Non-cash charges	0	0	0	(4)
Restructuring charges (recoveries)	0
Liability balance	0	0	0	0	0	0
Gain on Sale of Property and Equipment [Member]
Liability balance	0	0	0	0	0	0
Restructuring charges		0	0	0
Cash payments	0	0	0	0
Non-cash charges	622	0	0	0
Restructuring charges (recoveries)	(622)
Liability balance	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0