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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Note 1 - The Company and Basis of Presentation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Feb. 09, 2022	Apr. 03, 2022	Apr. 04, 2021	Jan. 02, 2022	Jan. 02, 2021
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Ending Balance		$ 20,140		$ 19,605
Line of Credit, Current		15,000		$ 15,000
Proceeds from Issuance of Common Stock		$ 1,482	$ 0
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.001		$ 0.001
Registered Direct Offering [Member]
Proceeds from Issuance of Common Stock	$ 1,500
Stock Issued During Period, Shares, New Issues (in shares)	310,000
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001
Shares Issued, Price Per Share (in dollars per share)	$ 4.78
Heritage Bank of Commerce [Member] \| Revolving Credit Facility [Member]
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Ending Balance		$ 20,100
Line of Credit, Current		15,000			$ 15,000
Line of Credit Facility, Maximum Borrowing Capacity		$ 15,000
Debt Instrument, Interest Rate, Effective Percentage		4.00%		3.75%