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Note 1 - The Company and Basis of Presentation (Details Textual) - USD ($)
9 Months Ended
Mar. 06, 2025
Feb. 25, 2025
Mar. 13, 2024
Sep. 28, 2025
Sep. 28, 2025
Sep. 29, 2024
Dec. 29, 2024
Dec. 28, 2024
Jun. 27, 2024
Jun. 28, 2023
Apr. 28, 2023
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation       $ 17,343,000 $ 17,343,000   $ 21,859,000        
Line of Credit, Current       15,000,000 $ 15,000,000   $ 18,000,000        
Proceeds from Issuance of Common Stock, Net       $ 5,900,000              
Common Stock, Par or Stated Value Per Share (in dollars per share)       $ 0.001 $ 0.001   $ 0.001        
Proceeds from Issuance of Common Stock       $ 6,100,000 $ 6,073,000 $ 3,560,000          
Payments of Stock Issuance Costs         154,000 $ 24,000          
Financing Receivable, after Allowance for Credit Loss, Noncurrent       0 0   $ 1,292,000        
Financing Receivable, Accrued Interest, after Allowance for Credit Loss       0 0   0        
The Note [Member]                      
Financing Receivable, after Allowance for Credit Loss, Noncurrent                     $ 1,160,000
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       1,390,000 1,390,000            
Financing Receivable, Accrued Interest, after Allowance for Credit Loss       $ 225,000 225,000            
Registered Direct Offering [Member]                      
Stock Issued During Period, Shares, New Issues (in shares) 256,200   223,000                
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.001   $ 0.001                
Proceeds from Issuance of Common Stock $ 1,500,000   $ 3,500,000                
Payments of Stock Issuance Costs $ 20,000   $ 24,000                
Shares Issued, Price Per Share (in dollars per share) $ 5.93   $ 16                
ATM Offering [Member]                      
Stock Issued During Period, Shares, New Issues (in shares)       713,228              
Common Stock, Par or Stated Value Per Share (in dollars per share)   $ 0.001                  
Proceeds from Issuance of Common Stock       $ 4,400,000              
Payments of Stock Issuance Costs       163,000              
Equity Issuable, Aggregate Maximum Offering, Amount   $ 20,000,000                  
Heritage Bank of Commerce [Member] | Revolving Credit Facility [Member]                      
Line of Credit, Current       $ 15,000,000 $ 15,000,000   $ 18,000,000        
Debt Instrument, Interest Rate, Effective Percentage       7.75% 7.75%   8.00% 8.00%