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Note 1 - The Company and Basis of Presentation (Details Textual) - USD ($)
shares in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Sep. 14, 2022
Feb. 09, 2022
Sep. 30, 2021
Sep. 22, 2021
Feb. 28, 2022
Jan. 01, 2023
Jan. 02, 2022
Jan. 03, 2021
Dec. 29, 2019
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Ending Balance           $ 19,201 $ 19,605 $ 22,748 $ 21,548
Line of Credit, Current           15,000 15,000    
Proceeds from Issuance of Common Stock           4,935 1,342 9,296  
Payments of Stock Issuance Costs           17 45 1,147  
Equity Securities without Readily Determinable Fair Value, Amount           300 300    
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total           1,987 295    
Contract with Customer, Liability, Current           272 455    
Revenue from Contract with Customer, Valuation Allowances And Reserves, Sales Return           1 13 $ 30  
Professional Services [Member]                  
Contract with Customer, Liability, Current           0 300    
Accounts Receivable [Member] | Professional Services [Member]                  
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total           $ 2,000 $ 300    
Intellectual Property [Member]                  
Finite-Lived Intangible Asset, Useful Life (Year)           5 years      
Common Stock [Member]                  
Stock Issued During Period, Shares, New Issues (in shares)           797 198 2,642  
Registered Direct Offering [Member]                  
Proceeds from Issuance of Common Stock $ 3,200 $ 1,500     $ 1,500        
Registered Direct Offering [Member] | Common Stock [Member]                  
Stock Issued During Period, Shares, New Issues (in shares)     74            
Share Subscription Agreement [Member]                  
Proceeds from Issuance of Common Stock, Net     $ 1,000            
Payments of Stock Issuance Costs     $ 45            
Share Subscription Agreement [Member] | Common Stock [Member]                  
Stock Issued During Period, Shares, New Issues (in shares)     74 125          
Registered Direct Offering [Member]                  
Stock Issued During Period, Shares, New Issues (in shares) 487 310              
Proceeds from Issuance of Common Stock $ 3,200 $ 1,500              
Heritage Bank of Commerce [Member] | Revolving Credit Facility [Member]                  
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Ending Balance           $ 19,100      
Line of Credit, Current           $ 15,000 $ 15,000