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Note 2 - Goodwill and Purchased Intangible Assets (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Mar. 28, 2020
Sep. 25, 2021
Sep. 26, 2020
Jun. 26, 2020
Sep. 25, 2021
Sep. 26, 2020
Dec. 26, 2020
Transfer From In-Process Technology to Developed Technology         $ 5,600    
Goodwill, Impairment Loss $ 0            
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   $ 0 $ 7,300   0 $ 11,249  
Amortization of Intangible Assets, Total   8,879 9,783   27,168 $ 28,848  
In-process Technology [Member]              
Indefinite-lived Intangible Assets (Excluding Goodwill), Ending Balance   $ 1,900     $ 1,900   $ 7,800
Indefinite-lived In Process Research and Development [Member]              
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) $ 3,900   $ 7,300 $ 11,200