Note 1 - Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Thousands		Dec. 28, 2019	Dec. 29, 2018
Property, plant and equipment		$ 114,139	$ 113,961
Less accumulated depreciation and amortization		(43,227)	(39,629)
Property, plant and equipment, net		70,912	74,332
Land and Land Improvements [Member]
Property, plant and equipment	[1]	11,659	11,905
Building and Building Improvements [Member]
Property, plant and equipment	[1]	41,474	37,265
Machinery and Equipment [Member]
Property, plant and equipment		$ 61,006	$ 64,791

[1] Includes assets under financing leases acquired with Xcerra totaling $2.6 million and $2.7 million as of December 28, 2019 and December 29, 2018, respectively.