Note 4 - Balance Sheet Components - Balance Sheet Components (Details) - USD ($) $ in Thousands	Jan. 02, 2022	Jan. 03, 2021
Inventories:
Raw material	$ 0	$ 191
Work-in-process	1,397	1,842
Finished goods	681	655
Inventory, Net, Total	2,078	2,688
Other current assets:
Prepaid expenses	921	884
Other	260	182
Prepaid Expense and Other Assets, Current	1,181	1,066
Property and equipment:
Property and equipment, gross	12,717	12,753
Accumulated depreciation and amortization	(12,218)	(12,205)
Property, Plant and Equipment, Net, Ending Balance	499	548
Capitalized internal-use software:
Capitalized software held for internal use	1,699	1,166
Accumulated amortization	(458)	(180)
Capitalized Computer Software, Net, Ending Balance	1,241	986
Accrued liabilities:
Employee compensation related accruals	953	762
Other	712	578
Accrued Liabilities, Current, Total	1,665	1,340
Equipment [Member]
Property and equipment:
Property and equipment, gross	10,341	10,471
Software [Member]
Property and equipment:
Property and equipment, gross	1,878	1,783
Furniture and Fixtures [Member]
Property and equipment:
Property and equipment, gross	32	33
Leasehold Improvements [Member]
Property and equipment:
Property and equipment, gross	$ 466	$ 466