Note 2 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Oct. 29, 2016	Apr. 30, 2016
Land	$ 9,500	$ 9,500
Buildings and improvements	50,943	50,856
Machinery and equipment	170,325	162,195
Total	230,768	222,551
Less accumulated depreciation	(165,741)	(160,619)
Property, plant and equipment – net	$ 65,027	$ 61,932