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Note 1 - The Company and Basis of Presentation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Feb. 09, 2022
Jul. 03, 2022
Jan. 02, 2022
Jul. 04, 2021
Jan. 03, 2021
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Ending Balance   $ 18,546 $ 19,605 $ 18,996 $ 22,748
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 $ 1,500 $ 1,600      
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   18,500      
Line of Credit, Current   15,000      
Line of Credit Facility, Maximum Borrowing Capacity   $ 15,000      
Debt Instrument, Interest Rate, Effective Percentage   5.25% 3.75%