Note 6 - Acquisitions - Maximum Deferred Consideration Payments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018
January 2, 2021	$ 344
January 1, 2022	1,438
December 31, 2022	1,276
Estimated future contingent consideration payments	3,058
Balance	4,773	$ 2,091
Contingent consideration paid	(598)	(300)
Increase to contingent payment estimates		2,935
Other changes in contingent payments	61	47
Reduction in final purchase price recorded	(1,178)
Balance	$ 3,058	$ 4,773