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Note 2 - Goodwill and Purchased Intangible Assets - Changes in Carrying Value of Goodwill (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 26, 2020
Dec. 28, 2019
Beginning balance $ 238,669 [1] $ 242,127
Adjustments   1,134
Impairments   (715)
Impact of currency exchange 5,672 (3,877)
Ending balance 244,341 238,669 [1]
Semiconductor Test and Inspection [Member]    
Beginning balance 218,775 220,808
Adjustments   2,117
Impairments   (715)
Impact of currency exchange 4,953 (3,435)
Ending balance 223,728 218,775
PCB Test [Member]    
Beginning balance 19,894 21,319
Adjustments   (983)
Impairments   0
Impact of currency exchange 719 (442)
Ending balance $ 20,613 $ 19,894
[1] Derived from December 28, 2019 audited financial statements