Note 6 - Intangible Assets - Schedule of Carrying Value of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2021	Dec. 29, 2019
Net Carrying Amount	$ 860
Sensi ML [Member]
Gross Carrying Amount	1,156	$ 1,156
Accumulated Amortization	(296)	(148)
Net Carrying Amount	$ 860	$ 1,008
Sensi ML [Member] | Developed Technology Rights [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	10 years	10 years
Gross Carrying Amount	$ 959	$ 959
Accumulated Amortization	(192)	(96)
Net Carrying Amount	$ 767	$ 863
Sensi ML [Member] | Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	2 years	2 years
Gross Carrying Amount	$ 81	$ 81
Accumulated Amortization	(81)	(40)
Net Carrying Amount	$ 0	$ 41
Sensi ML [Member] | Trademarks and Trade Names [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	10 years	10 years
Gross Carrying Amount	$ 116	$ 116
Accumulated Amortization	(23)	(12)
Net Carrying Amount	$ 93	$ 104