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Note 1 - The Company and Basis of Presentation (Details Textual) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended
Mar. 13, 2024
Mar. 21, 2023
Jun. 30, 2024
Jul. 02, 2023
Jun. 27, 2024
Dec. 31, 2023
Oct. 01, 2023
Jun. 28, 2023
Apr. 28, 2023
Jan. 01, 2023
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents     $ 23,266 $ 20,565   $ 24,606       $ 19,201
Line of Credit, Current     20,000     $ 20,000        
Proceeds from Issuance of Common Stock, Net     $ 3,500              
Common Stock, Par or Stated Value Per Share (in dollars per share)     $ 0.001     $ 0.001        
Proceeds from Issuance of Common Stock     $ 3,560 $ 2,313            
Financing Receivable, after Allowance for Credit Loss     1,229     $ 1,200        
The Note [Member]                    
Financing Receivable, after Allowance for Credit Loss, Noncurrent                 $ 1,160  
Financing Receivable, Interest Rate         10.00%     4.69% 3.00%  
Financing Receivable, Effective Annual Interest Rate               4.80%    
Financing Receivable Term (Month)         24 months          
Financing Receivable, Default Interest Rate         15.31%          
Financing Receivable, after Allowance for Credit Loss     1,230              
Financing Receivable, Accrued Interest, after Allowance for Credit Loss     66              
Registered Direct Offering [Member]                    
Stock Issued During Period, Shares, New Issues (in shares) 223 450                
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.001                  
Proceeds from Issuance of Common Stock $ 3,500 $ 2,300                
Shares Issued, Price Per Share (in dollars per share) $ 16 $ 5.14                
Asset Pledged as Collateral [Member]                    
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents     100              
Revolving Credit Facility [Member] | Heritage Bank of Commerce [Member]                    
Line of Credit, Current     $ 20,000     $ 20,000        
Debt Instrument, Interest Rate, Effective Percentage     9.00%     9.00% 9.00%