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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
3 Months Ended
Mar. 31, 2018
USD ($)
Balance $ 453,414
Additions 381,599 [1]
Currency translation 5,561
Balance 840,574
Electronics [Member]  
Balance 278,959
Additions 381,599 [1]
Currency translation 2,455
Balance 663,013
Automotive [Member]  
Balance 135,829
Additions [1]
Currency translation 3,195
Balance 139,024
Industrial [Member]  
Balance 38,626
Additions [1]
Currency translation (89)
Balance $ 38,537
[1] The additions resulted from the acquisition of IXYS.