Note 6 - Acquisitions - Proforma Revenue and Earnings (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Revenue	$ 50,705	$ 51,710	$ 102,300	$ 102,522
Operating income	$ 2,193	$ 890	$ 3,848	$ 2,610
Diluted net income per share (in dollars per share)		$ 0.03		$ 0.12
TKE [Member]
Revenue		$ 53,530		$ 106,161
Operating income		$ 1,196		$ 3,222
Diluted net income per share (in dollars per share)		$ 0.05		$ 0.15