Note 9 - Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 01, 2023	Jan. 02, 2022	Jan. 03, 2021
Income tax benefit at statutory rate	$ (876)	$ (1,364)	$ (2,331)
State taxes	3	3	3
Foreign taxes	106	124	34
Stock compensation and other permanent differences	21	(155)	171
PPP loan forgiveness	0	(250)	0
R&D tax credits	(318)	(230)	(261)
Expired tax attributes	3,563	3,303	208
Future benefit of deferred tax assets not recognized	2,401	1,312	(2,227)
Provision for income taxes	$ 98	$ 119	$ 51