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Note 1 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 01, 2024
USD ($)
Jun. 28, 2025
USD ($)
shares
Jun. 29, 2024
USD ($)
shares
Jun. 28, 2025
USD ($)
shares
Jun. 29, 2024
USD ($)
shares
Dec. 28, 2024
USD ($)
Accounts Receivable, Allowance for Credit Loss   $ 100   $ 100   $ 200
Capitalized Computer Software, Gross   8,000   8,000   9,300
Capitalized Computer Software, Amortization   700 $ 700 $ 1,418 $ 1,418  
Number of Operating Segments       3    
Number of Reportable Segments       1    
Goodwill and Intangible Asset Impairment $ 0          
Realized Gain (Loss), Foreign Currency Transaction, before Tax   $ (400) $ (400) $ (400) $ (900)  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares   574,000 538,000 638,000 272,000  
Revenue, Remaining Performance Obligation, Amount   $ 4,700   $ 4,700    
Accounts Receivable, Credit Loss Expense (Reversal)       0    
Contract with Customer, Asset, after Allowance for Credit Loss   0   0    
Contract with Customer, Liability   12,200   12,200   8,600
Deferred Profit   6,630   6,630   3,589 [1]
Deferred Profit Long-term   4,000   4,000   4,300
Accumulated Other Comprehensive Income (Loss), Net of Tax   $ (32,636)   $ (32,636)   $ (51,155) [1]
Computer Software, Intangible Asset [Member]            
Finite-Lived Intangible Asset, Useful Life (Year)   7 years   7 years    
Minimum [Member]            
Standard Product Warranty Term (Month)       12 months    
Maximum [Member]            
Standard Product Warranty Term (Month)       36 months    
Building [Member] | Minimum [Member]            
Property, Plant and Equipment, Useful Life   30 years   30 years    
Building [Member] | Maximum [Member]            
Property, Plant and Equipment, Useful Life   40 years   40 years    
Building Improvements [Member] | Minimum [Member]            
Property, Plant and Equipment, Useful Life   5 years   5 years    
Building Improvements [Member] | Maximum [Member]            
Property, Plant and Equipment, Useful Life   15 years   15 years    
Machinery, Equipment and Software [Member] | Minimum [Member]            
Property, Plant and Equipment, Useful Life   3 years   3 years    
Machinery, Equipment and Software [Member] | Maximum [Member]            
Property, Plant and Equipment, Useful Life   10 years   10 years    
[1] Derived from December 28, 2024, audited financial statements