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Note 1 - Summary of Significant Accounting Policies (Details Textual)
 3 Months Ended 6 Months Ended
Oct. 01, 2023
USD ($)
Jun. 29, 2024
USD ($)
Jul. 01, 2023
USD ($)
shares
Jun. 29, 2024
USD ($)
Jul. 01, 2023
USD ($)
shares
Dec. 30, 2023
USD ($)
Accounts Receivable, Allowance for Credit Loss   $ 300,000   $ 300,000   $ 300,000
Capitalized Computer Software, Gross   10,700,000   10,700,000   12,200,000
Capitalized Computer Software, Amortization   700,000 $ 700,000 $ 1,418,000 $ 1,400,000  
Number of Operating Segments       3    
Number of Reportable Segments       1    
Goodwill and Intangible Asset Impairment, Total $ 0          
Amortization of Debt Issuance Costs     32,000   100,000  
Realized Gain (Loss), Foreign Currency Transaction, before Tax   (400,000) $ (600,000) $ (900,000) $ (1,100,000)  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares     319,000   216,000  
Revenue, Remaining Performance Obligation, Amount   5,900,000   5,900,000    
Provision for Doubtful Accounts       0    
Contract with Customer, Asset, after Allowance for Credit Loss, Total   0   0    
Contract with Customer, Liability   8,400,000   8,400,000   8,800,000
Deferred Profit   3,327,000   3,327,000   3,586,000 [1]
Deferred Profit Long-term   4,600,000   4,600,000   4,900,000
Accumulated Other Comprehensive Income (Loss), Net of Tax   $ (46,953,000)   $ (46,953,000)   $ (34,779,000) [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 (Year)   30 years   30 years    
Building [Member] | Maximum [Member]            
Property, Plant and Equipment, Useful Life (Year)   40 years   40 years    
Building Improvements [Member] | Minimum [Member]            
Property, Plant and Equipment, Useful Life (Year)   5 years   5 years    
Building Improvements [Member] | Maximum [Member]            
Property, Plant and Equipment, Useful Life (Year)   15 years   15 years    
Machinery, Equipment and Software [Member] | Minimum [Member]            
Property, Plant and Equipment, Useful Life (Year)   3 years   3 years    
Machinery, Equipment and Software [Member] | Maximum [Member]            
Property, Plant and Equipment, Useful Life (Year)   10 years   10 years    
[1] Derived from December 30, 2023 audited financial statements