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Note 1 - The Company and Basis of Presentation (Details Textual) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended
Mar. 21, 2023
Oct. 01, 2023
Oct. 02, 2022
Jun. 28, 2023
Apr. 28, 2023
Jan. 01, 2023
Jan. 02, 2022
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents   $ 18,625 $ 20,036     $ 19,201 $ 19,605
Proceeds from Issuance of Common Stock   2,313 $ 0        
Line of Credit, Current   $ 15,000       $ 15,000  
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 $ 2,300            
Stock Issued During Period, Shares, New Issues (in shares) 450            
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.001            
Shares Issued, Price Per Share (in dollars per share) $ 5.14            
The Note [Member]              
Financing Receivable, after Allowance for Credit Loss, Noncurrent         $ 1,160    
Financing Receivable, Interest Rate       4.69% 3.00%    
Financing Receivable, Effective Annual Interest Rate       4.80%      
Financing Receivable, Default Interest Rate       10.00%      
Asset Pledged as Collateral [Member]              
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents   $ 100          
Heritage Bank of Commerce [Member] | Paycheck Protection Program [Member]              
Debt Instrument, Interest Rate, Stated Percentage           8.00%  
Heritage Bank of Commerce [Member] | Revolving Credit Facility [Member]              
Line of Credit Facility, Maximum Borrowing Capacity   15,000          
Line of Credit, Current   $ 15,000       $ 15,000  
Debt Instrument, Interest Rate, Effective Percentage   9.00%       8.00%