v3.26.1
Note 1 - The Company and Basis of Presentation (Details Textual) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended 6 Months Ended 18 Months Ended
Aug. 14, 2025
Mar. 06, 2025
Feb. 25, 2025
Jun. 28, 2026
Mar. 29, 2026
Jun. 29, 2025
Mar. 30, 2025
Jun. 28, 2026
Jun. 29, 2025
Jun. 28, 2026
Dec. 28, 2025
Restructuring Charges       $ 16,000   $ 21,000   $ 27,000 $ 75,000    
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation       18,475,000       18,475,000   $ 18,475,000 $ 18,840,000
Line of Credit, Current       $ 5,000,000       5,000,000   $ 5,000,000 $ 15,000,000
Proceeds from Issuance of Common Stock               $ 9,800,000 5,824,000    
Common Stock, Par or Stated Value Per Share (in dollars per share)       $ 0.001       $ 0.001   $ 0.001 $ 0.001
Payments of Stock Issuance Costs               $ 256,000 128,000    
Sunflower Bank [Member] | Revolving Credit Facility [Member]                      
Line of Credit, Current       $ 5,000,000       5,000,000   $ 5,000,000  
Line of Credit Facility, Maximum Borrowing Capacity       $ 10,000,000       $ 10,000,000   $ 10,000,000  
Debt Instrument, Interest Rate, Stated Percentage       5.50%       5.50%   5.50%  
Debt Instrument, Basis Spread on Variable Rate               0.50%      
Debt Instrument, Fee Amount       $ 30,000       $ 30,000   $ 30,000  
Debt Instrument, Interest Rate, Effective Percentage       7.25%       7.25%   7.25%  
ATM Offering [Member]                      
Proceeds from Issuance of Common Stock               $ 9,500,000 $ 4,100,000    
Common Stock, Par or Stated Value Per Share (in dollars per share)     $ 0.001                
Equity Issuable, Aggregate Maximum Offering, Amount $ 125,000,000   $ 20,000,000                
Stock Issued During Period, Shares, New Issues (in shares)               903 678    
Payments of Stock Issuance Costs               $ 297,000 $ 157,000    
ATM Offering [Member] | Common Stock [Member]                      
Equity Issuable, Aggregate Maximum Offering, Amount $ 20,000,000                    
Stock Issued During Period, Shares, New Issues (in shares)       500 403 496 182        
Registered Direct Offering [Member]                      
Proceeds from Issuance of Common Stock   $ 1,500,000                  
Common Stock, Par or Stated Value Per Share (in dollars per share)   $ 0.001                  
Stock Issued During Period, Shares, New Issues (in shares)   256                  
Payments of Stock Issuance Costs   $ 20,000                  
Shares Issued, Price Per Share (in dollars per share)   $ 5.93                  
Discontinued Operations [Member] | Sensi ML [Member]                      
Restructuring Charges       $ 16,000   $ 21,000   $ 27,000 $ 162,000 $ 200,000