Note 9 - Plant Restructuring - Restructuring Reserve (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Dec. 29, 2018	Dec. 30, 2017
Balance						$ 342		$ 342
Quarter charge (credit)	$ 378	$ 841	110	$ 101	$ (33)	72
Cash payments/write offs							(976)	(384)
Balance	353			98			353	98
Employee Severance [Member]
Balance						37		37
Quarter charge (credit)	378	841	110	98		36
Cash payments/write offs							(976)	(73)
Balance	353			98			353	98
Other Restructuring [Member]
Balance						305		305
Quarter charge (credit)				3	$ (33)	$ 36
Cash payments/write offs								(311)
Balance