Note 6 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	Mar. 25, 2016	Dec. 31, 2016		Jan. 02, 2016		Dec. 27, 2014
Goodwill, Acquired During Period		$ 224,140	[1]	$ 1,470	[2]
Goodwill and Intangible Asset Impairment		14,809
Amortization of Intangible Assets		19,337		11,898		12,501
Impairment of Intangible Assets, Finite-lived		6,000
Automotive [Member]
Goodwill, Acquired During Period	$ 61,300	70,762	[1]	1,994
Industrial [Member]
Goodwill, Acquired During Period		(8,794)	[1]		[2]
Goodwill and Intangible Asset Impairment		$ 8,800		$ 0		$ 0

[1] Included The net additions of $224,140 resulted primarily from the acquisitions of PolySwitch, ON and Menber's, partially offset by the impairment of custom products reporting unit goodwill.

[2] Electronics reduction resulted from reclassification of goodwill to customer relationships. Automotive addition of $2.0 million resulted from business acquisitions.