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Note 13 - Information Concerning Segments, Product Lines, Geographic Information, Accounts Receivable, and Revenue Concentration (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 28, 2025
USD ($)
Sep. 29, 2024
USD ($)
Sep. 28, 2025
USD ($)
Sep. 29, 2024
USD ($)
Dec. 30, 2024
USD ($)
Dec. 29, 2024
USD ($)
Dec. 20, 2024
USD ($)
Number of Operating Segments     1        
Revenue from Contract with Customer, Excluding Assessed Tax $ 2,029 $ 4,209 $ 10,041 $ 13,974      
Contract with Customer, Liability, Current 382   $ 382     $ 444  
Number of Reportable Segments     1        
UNITED STATES              
Revenue from Contract with Customer, Excluding Assessed Tax $ 1,000 $ 3,600 $ 7,800 $ 11,600      
Percentage of Revenue 50.00% 85.00% 78.00% 83.00%      
Professional Services [Member]              
Revenue from Contract with Customer, Excluding Assessed Tax $ 700 $ 3,400 $ 6,900 $ 10,000      
Contract with Customer, Asset, after Allowance for Credit Loss 1,400   1,400     $ 2,700  
Contract with Customer, Liability, Current 400   400   $ 400   $ 400
Revenue, Remaining Performance Obligation, Amount $ 2,200   $ 2,200