Note 5 - Debt Obligations (Details Textual) - Heritage Bank of Commerce [Member] - Revolving Credit Facility [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Oct. 02, 2022	Oct. 03, 2021	Oct. 02, 2022	Oct. 03, 2021	Jan. 02, 2022
Line of Credit Facility, Maximum Month-end Outstanding Amount			$ 15,000		$ 15,000
Debt Instrument, Interest Rate, Effective Percentage	6.75%		6.75%		3.75%
Interest Expense, Debt, Total	$ 11	$ 22	$ 50	$ 68

Maximum month-end amount borrowed under the credit facility during the period.

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Name:	us-gaap_LineOfCreditFacilityMaximumMonthendOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration