Note 4 - Balance Sheet Components - Balance Sheet Components (Details) - USD ($) $ in Thousands	Jan. 03, 2021	Dec. 29, 2019
Inventories:
Raw material	$ 191	$ 222
Work-in-process	1,842	2,370
Finished goods	655	668
Inventory, Net, Total	2,688	3,260
Other current assets:
Prepaid expenses	884	1,296
Other	182	269
Other Assets, Current	1,066	1,565
Property and equipment:
Property and equipment, gross	12,753	12,993
Accumulated depreciation and amortization	(12,205)	(12,163)
Property, Plant and Equipment, Net, Ending Balance	548	830
Capitalized internal-use software:
Capitalized software held for internal use	1,166	365
Accumulated amortization	(180)	(32)
Capitalized Computer Software, Net, Ending Balance	986	333
Accrued liabilities:
Employee compensation related accruals	762	713
Other	578	420
Accrued Liabilities, Current, Total	1,340	1,133
Equipment [Member]
Property and equipment:
Property and equipment, gross	10,471	10,694
Software [Member]
Property and equipment:
Property and equipment, gross	1,783	1,789
Furniture and Fixtures [Member]
Property and equipment:
Property and equipment, gross	33	36
Leasehold Improvements [Member]
Property and equipment:
Property and equipment, gross	$ 466	$ 474