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Note 4 - Goodwill and Other Intangible Assets - Amounts for Goodwill and Changes in Carrying Value by Operating Segment (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Balance $ 453,414
Additions 382,317 [1]
Currency translation (3,504)
Balance 832,227
Electronics [Member]  
Balance 278,959
Additions 382,317 [1]
Currency translation (1,558)
Balance 659,718
Automotive [Member]  
Balance 135,829
Additions [1]
Currency translation (1,748)
Balance 134,081
Industrial [Member]  
Balance 38,626
Additions [1]
Currency translation (198)
Balance $ 38,428
[1] The additions resulted from the acquisition of IXYS.