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Note 1 - Summary of Significant Accounting Policies (Details Textual)
3 Months Ended 6 Months Ended
Jun. 26, 2021
USD ($)
Oct. 01, 2020
USD ($)
Jun. 26, 2021
USD ($)
shares
Jun. 27, 2020
USD ($)
shares
Jun. 26, 2021
USD ($)
shares
Jun. 24, 2021
Jun. 27, 2020
USD ($)
shares
Dec. 26, 2020
USD ($)
Accounts Receivable, Allowance for Credit Loss, Ending Balance $ 400,000   $ 400,000   $ 400,000     $ 100,000
Capitalized Computer Software, Gross $ 12,900,000   12,900,000   12,900,000     13,500,000
Capitalized Computer Software, Amortization     300,000 $ 300,000 $ 748,000   $ 513,000  
Number of Operating Segments         3      
Number of Reportable Segments 1         2    
Goodwill and Intangible Asset Impairment, Total   $ 0            
Amortization of Debt Issuance Costs     200,000 300,000 $ 500,000   600,000  
Foreign Currency Transaction Gain (Loss), Realized     $ (25,000) $ (600,000) $ (300,000)   $ (1,000,000.0)  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares     240,000 286,000 120,000   172,000  
Revenue, Remaining Performance Obligation, Amount $ 8,000,000.0   $ 8,000,000.0   $ 8,000,000.0      
Deferred Revenue, Total 36,200,000   36,200,000   36,200,000     17,100,000
Deferred Profit 17,480,000   17,480,000   17,480,000     8,671,000 [1]
Deferred Profit Long-term 6,400,000   6,400,000   6,400,000     6,700,000
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total $ (14,240,000)   $ (14,240,000)   $ (14,240,000)     $ (4,326,000) [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