Note 6 - Acquisitions - Maximum Deferred Consideration Payments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
December 29, 2018	$ 741
December 28, 2019	625
January 2, 2021	725
Estimated future contingent consideration payments	2,091
Balance	1,231	$ 1,800
Contingent consideration paid	(1,694)	(993)
Estimated contingent payments, acquisitions	1,773	139
Increase to contingent payment estimates	781	285
Balance	$ 2,091	$ 1,231