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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2022 USD ($) | Jun. 24, 2021 | Dec. 31, 2022 USD ($) shares | Dec. 25, 2021 USD ($) shares | Dec. 26, 2020 USD ($) shares
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares |  |  | 261,000 | 180,000 | 113,000
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense |  |  | $ 7,200 | $ 7,100 | $ 8,100
Gain (Loss) on Disposition of Property Plant Equipment, Total |  |  | (0) | (0) | 4,495
Depreciation, Total |  |  | 12,800 | 13,200 | 14,000
Capitalized Computer Software, Gross |  |  | 14,700 | 13,500 |
Capitalized Computer Software, Amortization |  |  | $ 2,060 | $ 1,644 | 1,191
Number of Operating Segments |  |  |  | 3 |
Number of Reportable Segments |  | 2 | 1 | 1 |
Goodwill and Intangible Asset Impairment, Total | $ 0 |  |  |  |
Revenue, Remaining Performance Obligation, Amount |  |  | $ 7,100 | $ 7,700 |
Provision for Doubtful Accounts |  |  |  | 0 |
Contract with Customer, Asset, after Allowance for Credit Loss, Total |  |  |  | 0 |
Contract with Customer, Liability, Total |  |  | 16,100 | 21,900 |
Deferred Profit |  |  | 8,022 | 13,208 |
Deferred Profit Long-term |  |  | 5,500 | 6,100 |
Amortization of Debt Issuance Costs |  |  | 300 | 600 | 1,200
Foreign Currency Transaction Gain (Loss), Realized |  |  | 1,600 | 400 |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total |  |  | (40,012) | (27,262) |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax |  |  | $ (18,000) | $ (23,000) |
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 |  |
Xcerra [Member] |  |  |  |  |
Inventory Write-down |  |  |  |  | $ 2,100

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