Note 9 - Intangible Assets - Finite Lived Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Intangible Assets, gross	$ 138,297	$ 134,380
Accumulated Amortization	(131,976)	(127,403)
Intangible Assets, net	$ 6,321	$ 6,977	$ 11,900
Developed Technology [Member]
Weighted Average Amortization (Year)	5 years	5 years
Intangible Assets, gross	$ 110,987	$ 110,987
Accumulated Amortization	(109,162)	(105,594)
Intangible Assets, net	$ 1,825	$ 5,393
Customer Relationships [Member]
Weighted Average Amortization (Year)	5 years 9 months 18 days	5 years 9 months 18 days
Intangible Assets, gross	$ 22,934	$ 22,934
Accumulated Amortization	(22,281)	(21,400)
Intangible Assets, net	$ 653	$ 1,534
Licensed Technology [Member]
Weighted Average Amortization (Year)	6 years 7 months 6 days	5 years
Intangible Assets, gross	$ 4,376	$ 459
Accumulated Amortization	(533)	(409)
Intangible Assets, net	$ 3,843	$ 50