Note 8 - Intangible Assets - Components of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016
Balance	$ 252	$ 194
Intangibles acquired, SDS acquisition		140
Amortization of intangibles during the fifty-two week period ended	(81)	(82)
Balance	171	252
Engineering [Member]
Balance	252	189
Intangibles acquired, SDS acquisition		140
Amortization of intangibles during the fifty-two week period ended	(81)	(77)
Balance	171	252
Information Technology [Member]
Balance		5
Intangibles acquired, SDS acquisition
Amortization of intangibles during the fifty-two week period ended		(5)
Balance