Note 2 - Other Relevant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Jan. 01, 2023	Jan. 02, 2022	Jan. 03, 2021
Operating Expenses, Denominated in Foreign Currency, Percent	12.00%	21.00%	18.00%
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	$ 27	$ 5
Accounts Receivable, Allowance for Credit Loss, Ending Balance	18	62
Accounts Receivable, Credit Loss Expense (Reversal)	18	62	$ 0
Goodwill, Impairment Loss	0	0
Impairment of Intangible Assets, Finite-Lived	$ 0	0
Number of suppliers	1
Selling, General and Administrative Expenses [Member]
Marketing and Advertising Expense, Total	$ 40	47	$ 76
Other Current Assets [Member]
Operating Lease, Right-of-Use Asset	1,400	1,500
Other Liabilities [Member]
Operating Lease, Liability, Total	$ 1,400	$ 1,600
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	1 year
Minimum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment, Useful Life (Year)	1 year
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	7 years
Finite-Lived Intangible Asset, Useful Life (Year)	5 years
Maximum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment, Useful Life (Year)	7 years