Note 6 - Acquisitions (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Dec. 31, 2016 BGA [Member]	Jan. 02, 2016 BGA [Member]	Jan. 03, 2015 BGA [Member]	Dec. 28, 2013 BGA [Member]	Sep. 28, 2013 Maximum [Member] BGA [Member]
Note 6 - Acquisitions (Details) [Line Items]
Business Combination, Contingent Consideration, Liability			$ 307	$ 269	$ 253	$ 313	$ 3,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	$ (92)	$ (43)