Note 3 - Goodwill and Purchased Intangible Assets - Changes in Carrying Value of Goodwill (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 29, 2018	Dec. 30, 2017
Beginning balance		$ 65,613	$ 58,849
Additions		179,263	2,654
Impact of currency exchange		(2,749)	4,110
Ending balance		242,127	65,613
Semiconductor Test and Inspection [Member]
Beginning balance	[1]	65,613	58,849
Additions	[1]	157,661	2,654
Impact of currency exchange	[1]	(2,466)	4,110
Ending balance	[1]	220,808	65,613
PCB Test [Member]
Beginning balance
Additions		21,602
Impact of currency exchange		(283)
Ending balance		$ 21,319

[1] After the acquisition of Xcerra on October 1, 2018 we report in two segments, Semiconductor Test & Inspection and PCB Test. Historical goodwill amounts would have been reported in our Semiconductor Test & Inspection segment and have been presented accordingly.