Note 3 - Goodwill and Purchased Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

Schedule of Goodwill [Table Text Block]

	Total Goodwill
Balance December 27, 2014	$	63,132
Impact of currency exchange		(2,868	)
Balance December 26, 2015		60,264
Impact of currency exchange		(1,415	)
Balance December 31, 2016	$	58,849

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	December 31, 2016						December 26, 2015
					Remaining
	Gross Carrying		Accumulated		Useful Life		Gross Carrying		Accumulated
	Amount		Amortization		(years)		Amount		Amortization
Rasco technology	$	25,785	$	25,785		-	$	26,904	$	23,776
Ismeca technology		26,191		13,241		4.0		27,043		10,329
Trade names		5,353		468		13.7		5,547		92
	$	57,329	$	39,494			$	59,494	$	34,197