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Note 1 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
3 Months Ended
Oct. 01, 2020
USD ($)
Mar. 27, 2021
USD ($)
shares
Mar. 28, 2020
USD ($)
shares
Dec. 26, 2020
USD ($)
Accounts Receivable, Allowance for Credit Loss, Ending Balance   $ 400   $ 100
Capitalized Computer Software, Gross   12,700   13,500
Capitalized Computer Software, Amortization   $ 370 $ 205  
Number of Operating Segments   4    
Number of Reportable Segments   2    
Goodwill and Intangible Asset Impairment, Total $ 0   3,900  
Amortization of Debt Issuance Costs   $ 300 300  
Foreign Currency Transaction Gain (Loss), Realized   $ (300) $ (400)  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares   0 58,000  
Revenue, Remaining Performance Obligation, Amount   $ 8,200    
Deferred Revenue, Total   25,400   17,100
Deferred Profit   12,955   8,671 [1]
Deferred Profit Long-term   6,500   6,700
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total   $ (14,758)   $ (4,326) [1]
Computer Software, Intangible Asset [Member]        
Finite-Lived Intangible Asset, Useful Life (Year)   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    
Building [Member] | Maximum [Member]        
Property, Plant and Equipment, Useful Life (Year)   40 years    
Building Improvements [Member] | Minimum [Member]        
Property, Plant and Equipment, Useful Life (Year)   5 years    
Building Improvements [Member] | Maximum [Member]        
Property, Plant and Equipment, Useful Life (Year)   15 years    
Machinery, Equipment and Software [Member] | Minimum [Member]        
Property, Plant and Equipment, Useful Life (Year)   3 years    
Machinery, Equipment and Software [Member] | Maximum [Member]        
Property, Plant and Equipment, Useful Life (Year)   10 years    
[1] Derived from December 26, 2020 audited financial statements