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Note 1 - The Company and Basis of Presentation (Details Textual) - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Mar. 21, 2023
Sep. 14, 2022
Feb. 09, 2022
Sep. 30, 2021
Sep. 22, 2021
Dec. 31, 2023
Jan. 01, 2023
Jan. 02, 2022
Jan. 03, 2021
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents           $ 24,606 $ 19,201 $ 19,605 $ 22,748
Line of Credit, Current           20,000 15,000    
Proceeds from Issuance of Common Stock           2,313 4,682 1,079  
Payments of Stock Issuance Costs           20 17 45  
Recorded Sales Returns           8 2 $ (13)  
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property           $ 0 $ 27    
Internal Use Software [Member]                  
Property, Plant and Equipment, Useful Life (Year)           5 years      
Pre-Product Design And Development [Member]                  
Property, Plant and Equipment, Useful Life (Year)           7 years      
Minimum [Member]                  
Property, Plant and Equipment, Useful Life (Year)           1 year      
Finite-Lived Intangible Asset, Useful Life (Year)           5 years      
Minimum [Member] | Leasehold Improvements [Member]                  
Property, Plant and Equipment, Useful Life (Year)           3 years      
Maximum [Member]                  
Property, Plant and Equipment, Useful Life (Year)           10 years      
Finite-Lived Intangible Asset, Useful Life (Year)           7 years      
Maximum [Member] | Leasehold Improvements [Member]                  
Property, Plant and Equipment, Useful Life (Year)           5 years      
Common Stock [Member]                  
Stock Issued During Period, Shares, New Issues (in shares)           450 797 198  
Share Subscription Agreement [Member]                  
Proceeds from Issuance of Common Stock, Net         $ 45        
Payments of Stock Issuance Costs       $ 1,000          
Share Subscription Agreement [Member] | Common Stock [Member]                  
Stock Issued During Period, Shares, New Issues (in shares)       74 125        
Registered Direct Offering [Member]                  
Proceeds from Issuance of Common Stock $ 2,300                
Registered Direct Offering [Member] | Common Stock [Member]                  
Stock Issued During Period, Shares, New Issues (in shares)       74          
Registered Direct Offering [Member]                  
Stock Issued During Period, Shares, New Issues (in shares) 450 487 310            
Proceeds from Issuance of Common Stock $ 2,300 $ 3,200 $ 1,500            
Heritage Bank of Commerce [Member] | Revolving Credit Facility [Member]                  
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents           $ 24,600      
Line of Credit, Current           $ 20,000 $ 15,000