Note 4 - Balance Sheet Details (Details) - Property, Plant and Equipment - USD ($) $ in Thousands	Sep. 27, 2015	Mar. 29, 2015
Property, Plant and Equipment [Abstract]
Land	$ 6,660	$ 6,660
Building	17,413	17,431
Machinery and equipment	41,228	41,449
Software and licenses	22,592	22,044
Property, plant and equipment, total	87,893	87,584
Accumulated depreciation and amortization	(64,566)	(61,507)
Total property, plant and equipment, net	$ 23,327	$ 26,077