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Note 10 - Income Taxes - Components of Income Tax Expense Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2022	Jan. 03, 2021	Dec. 29, 2019
Loss before income taxes	$ (6,497)	$ (11,100)	$ (15,524)
Federal	0	0	0
State	3	3	3
Foreign	22	39	108
Subtotal	25	42	111
Federal	0	0	(141)
State	0	0	(44)
Foreign	94	9	(6)
Subtotal	94	9	(191)
Provision for (benefit from) income taxes	119	51	(80)
Domestic Tax Authority [Member]
U.S.	(6,461)	(11,170)	(15,813)
Foreign Tax Authority [Member]
Foreign	$ (36)	$ 70	$ 289

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