Note 5 - Property, Plant and Equipment - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 29, 2024	Mar. 31, 2024	Jul. 01, 2023
Property, Plant and Equipment, Gross	$ 784,629	$ 772,622	$ 747,056
Less: accumulated depreciation	(476,975)	(467,606)	(441,835)
Property, plant and equipment, net	307,654	305,016	305,221
Land and Land Improvements [Member]
Property, Plant and Equipment, Gross	49,985	49,627	46,693
Building and Building Improvements [Member]
Property, Plant and Equipment, Gross	237,690	236,141	219,936
Machinery and Equipment [Member]
Property, Plant and Equipment, Gross	467,272	457,433	428,355
Office Furniture, Vehicles and Computer Software [Member]
Property, Plant and Equipment, Gross	15,374	14,971	12,368
Construction in Progress [Member]
Property, Plant and Equipment, Gross	$ 14,308	$ 14,450	$ 39,704