Note 9 - Plant Restructuring - Restructuring Reserve (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Jan. 01, 2022	Oct. 02, 2021	Jul. 03, 2021	Dec. 26, 2020	Sep. 26, 2020	Jun. 27, 2020	Jan. 01, 2022	Dec. 26, 2020
Balance			$ 0			$ 202	$ 0	$ 202
Charge to expense	$ (110)	$ 47	66	$ (118)	$ 24	263
Cash payments/write offs							(3)	(371)
Balance	0			0			0	0
Employee Severance [Member]
Balance			0			202	0	202
Charge to expense		0	0	0	8	219
Cash payments/write offs							0	(429)
Balance	0			0			0	0
Other Restructuring [Member]
Balance			0			0	0	0
Charge to expense	(110)	$ 47	$ 66	(118)	$ 16	$ 44
Cash payments/write offs							(3)	58
Balance	$ 0			$ 0			$ 0	$ 0