Note 1 - Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Thousands		Dec. 29, 2018	Dec. 30, 2017
Property, plant and equipment		$ 113,961	$ 67,129
Less accumulated depreciation and amortization		(39,629)	(32,957)
Property, plant and equipment, net		74,332	34,172
Land and Land Improvements [Member]
Property, plant and equipment		11,905	8,017
Building and Building Improvements [Member]
Property, plant and equipment	[1]	37,265	13,779
Machinery and Equipment [Member]
Property, plant and equipment		$ 64,791	$ 45,333

[1] Includes assets under capital leases acquired with Xcerra totaling $2.7 million as of December 29, 2018.