Note 7 - Restructuring - Activity Related to Restructuring Plans (Details) - USD ($) $ in Thousands		12 Months Ended
		Jan. 02, 2021	Jan. 02, 2021	Dec. 28, 2019		Dec. 29, 2018
Accrued Restructuring			$ 7,610	$ 10,680		$ 2,447
Restructuring charges		$ 3,937	3,937	4,664		17,349
Costs paid or otherwise settled		(2,404)		(7,734)		(9,116)
Accrued Restructuring		9,143	9,143	7,610		10,680
Employee Severance [Member]
Accrued Restructuring	[1]		160	1,814		1,192
Restructuring charges		1,669		625	[1]	5,696	[1]
Costs paid or otherwise settled		(1,583)		(2,279)	[1]	(5,074)	[1]
Accrued Restructuring	[1]	246	246	160		1,814
Lease Termination and Fixed Assets [Member]
Accrued Restructuring			6,585	8,630		870
Restructuring charges		1,896		2,716		7,379
Costs paid or otherwise settled		(248)		(4,761)
Costs paid or otherwise settled						(381)
Accrued Restructuring		8,233	8,233	6,585		8,630
Software Contracts and Engineering Tools [Member]
Accrued Restructuring	[2]		0	218		360
Restructuring charges		0		0	[2]	913	[2]
Costs paid or otherwise settled		0		(218)	[2]	(1,055)	[2]
Accrued Restructuring	[2]	0	0	0		218
Other Restructuring [Member]
Accrued Restructuring	[3]		865	18		25
Restructuring charges		372		1,323	[3]	3,361	[3]
Costs paid or otherwise settled		(573)		(476)	[3]	(3,368)	[3]
Accrued Restructuring	[3]	$ 664	$ 664	$ 865		$ 18

[1] Includes employee relocation costs and outplacement costs, and accelerated stock compensation

[2] Includes cancellation of contracts, asset impairments, and accelerated depreciation on certain enterprise resource planning and customer relationship management systems

[3] In fiscal 2018, "Other" includes the abandonment of long-lived assets related to the restructuring of our agreements with a privately-held investee. In fiscal and 2019 and 2020, "Other" included termination fees on the cancellation of certain contracts under the Q2 2019 Sales Plan