Note 2 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Apr. 29, 2023	Apr. 30, 2022
Statement [Line Items]
Land	$ 9,835	$ 9,835
Buildings and improvements	70,615	65,697
Machinery and equipment	289,567	277,163
Total	370,017	352,695
Less accumulated depreciation	(221,594)	(208,437)
Property, plant and equipment – net	$ 148,423	$ 144,258