Note 6 - Acquisitions - Proforma Revenue and Earnings (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018
Revenue from Contract with Customer, Including Assessed Tax	$ 191,100	$ 200,352
Operating income	$ 6,567	$ 5,415
Diluted net income per share (in dollars per share)		$ 0.22
TKE [Member]
Revenues		$ 205,732
Operating income		$ 6,333
Diluted net income per share (in dollars per share)		$ 0.26