Note 2 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jan. 28, 2017	Apr. 30, 2016
Land	$ 9,500	$ 9,500
Buildings and improvements	50,971	50,856
Machinery and equipment	173,577	162,195
Total	234,048	222,551
Less accumulated depreciation	(168,394)	(160,619)
Property, plant and equipment – net	$ 65,654	$ 61,932