Note 6 - Acquisitions (Details Textual) - USD ($) $ in Millions	6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015
BGA [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 1.9
PCI [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	1.9
SDS [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	1.5
Contingent Consideration [Member]
Payments to Acquire Businesses, Gross	$ 0.7	$ 0.1