Note 10 - Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2022	Jan. 03, 2021	Dec. 29, 2019
Income tax (benefit) at statutory rate	$ (1,364)	$ (2,331)	$ (3,260)
State taxes	3	3	(42)
Foreign taxes	124	34	41
Stock compensation and other permanent differences	(155)	171	245
PPP Loan Forgiveness	(250)	0	0
R&D Tax Credits	(230)	(261)	(286)
Expired tax attributes	3,304	208	1,085
Future benefit of deferred tax assets not recognized	1,312	(2,227)	(2,277)
Other	0	0	(140)
Provision for (benefit from) income taxes	$ 119	$ 51	$ (80)