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Note 10 - Income Taxes - Reconciliation of Income Tax Computed at U.S. Federal Statutory Tax Rate to Provision (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 27, 2025
Dec. 28, 2024
Dec. 30, 2023
Tax provision at U.S. Federal statutory rate $ (13,105) $ (13,638) $ 9,470
Tax provision at U.S. Federal statutory rate, percent 21.00% 21.00% 21.00%
State and local income taxes, net of federal income tax effect $ 902 [1] $ (2,126) $ (633)
State and local income taxes, net of federal income tax effect, percent [1] (1.40%)    
Tax on Global Intangible Low-Taxed Income (GILTI) $ 2,543 2,613 1,735
Tax on Global Intangible Low-Taxed Income (GILTI), percent (4.10%)    
Tax on Subpart F Income $ 1,031    
Tax on Subpart F Income, percent (1.70%)    
Accruals, adjustments and releases from statute expirations   (2,372) 579
Reversal of previously recognized unborn foreign tax credits $ 4,853    
Reversal of previously recognized unborn foreign tax credits, percent (7.80%)    
Research and development credits $ (2,002) (1,103) (1,360)
Research and development credits, percent 3.20%    
Equity based employee compensation $ 1,886 502 (1,504)
Change in valuation allowance $ 12,918 14,844 10,654
Change in valuation allowance, percent (20.70%)    
Excess executive compensation   715 1,375
Equity based employee compensation, percent (3.00%)    
Other. nondeductible $ (232)    
Other, nondeductible, percent 0.40%    
Changes in unrecognized tax benefits $ (3,164)    
Changes in unrecognized tax benefits, percent 5.10%    
Foreign rate differential   146 2,093
Withholding and other foreign taxes, net of foreign tax credit   1,206 254
Other, net $ 309 4,085 (5,003)
Income Tax Expense (Benefit) 11,866 4,872 17,660
FX of net investment hedge $ (745)    
FX of net investment hedge, percent 1.20%    
Other $ 309 $ 4,085 $ (5,003)
Other, percent (0.50%)    
Income tax expense, percent (19.00%)    
Foreign Tax Jurisdiction [Member] | Federal Ministry of Finance, Germany [Member]      
Foreign rate differential $ 646    
Foreign rate differential, percent (1.00%)    
Local income taxes $ 1,460    
Local income taxes, percent (2.30%)    
Other $ (269)    
Other, percent 0.40%    
Foreign Tax Jurisdiction [Member] | Bureau of Internal Revenue, Philippines [Member]      
Other $ 313    
Other, percent (0.50%)    
Local country tax holiday $ (756)    
Local country tax holiday, percent 1.20%    
Foreign Tax Jurisdiction [Member] | Swiss Federal Tax Administration (FTA) [Member]      
Other $ 683    
Other, percent (1.10%)    
Withholding taxes $ 1,326    
Withholding taxes, percent (2.10%)    
Foreign Tax Jurisdiction [Member] | Inland Revenue Board of Malaysia [Member]      
Change in valuation allowance $ 3,490    
Change in valuation allowance, percent (5.60%)    
Other $ 34    
Other, percent (0.10%)    
Foreign Tax Jurisdiction [Member] | Other Foreign Jurisdictions [Member]      
Other $ (255)    
Other, percent 0.40%    
[1] State and local taxes in CA and TX comprise the majority of this category.