Note 6 - Intangible Assets - Schedule of Carrying Value of Intangible Assets (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 03, 2021	Jan. 02, 2022
Net Carrying Amount		$ 753
Sensi ML [Member]
Gross Carrying Amount	$ 1,156	1,156
Accumulated Amortization	(296)	(403)
Net Carrying Amount	$ 860	$ 753
Sensi ML [Member] | Developed Technology Rights [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	8 years	7 years
Gross Carrying Amount	$ 959	$ 959
Accumulated Amortization	(192)	(287)
Net Carrying Amount	$ 767	672
Sensi ML [Member] | Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	1 year
Gross Carrying Amount	$ 81	81
Accumulated Amortization	(81)	(81)
Net Carrying Amount	$ 0	$ 0
Sensi ML [Member] | Trademarks and Trade Names [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	8 years	7 years
Gross Carrying Amount	$ 116	$ 116
Accumulated Amortization	(23)	(35)
Net Carrying Amount	$ 93	$ 81