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Note 2 - Other Relevant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Jan. 01, 2023
Jan. 02, 2022
Accounts Receivable, Allowance for Credit Loss $ 34 $ 18  
Accounts Receivable, Credit Loss Expense (Reversal) 24 16 $ 62
Contract with Customer, Asset, after Allowance for Credit Loss, Current 3,609 1,987  
Contract with Customer, Liability, Current 1,052 272  
Current Expected Credit Losses (CECL)   0  
Property, Plant and Equipment, Net 8,948 1,398  
Notes Payable 1,400 900  
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 13,251 12,618  
Property, Plant and Equipment, Gross 22,199 14,016  
Operating Lease, Right-of-Use Asset 1,000 500  
Operating Lease, Liability 1,000 500  
Equity Securities without Readily Determinable Fair Value, Amount 300 300  
Goodwill, Impairment Loss $ 0 $ 0  
Operating Expenses, Denominated in Foreign Currency, Percent 8.00% 12.00% 14.00%
Number of suppliers   1  
Selling, General and Administrative Expenses [Member]      
Marketing and Advertising Expense $ 44 $ 40 $ 47
Revision of Prior Period, Reclassification, Adjustment [Member]      
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment   616  
Reclassified From ROU Assets To PP&E [Member]      
Property, Plant and Equipment, Net   933  
Property, Plant and Equipment, Gross 650 690  
Reclassified From Lease Liabilities To Notes Payable [Member]      
Notes Payable   887  
Reclassification From Payments on Notes Payable to Financing Arrangements [Member]      
Repayments of Notes Payable 452 378  
Professional Services [Member]      
Contract with Customer, Liability, Current 1,100 300 500
Accounts Receivable [Member] | Professional Services [Member]      
Contract with Customer, Asset, after Allowance for Credit Loss, Current $ 3,600 $ 2,000 $ 300