Note 2 - Business Acquisitions - Preliminary Allocation of Intangible Assets, Xcerra Acquisition (Details) - Xcerra [Member] $ in Thousands	Oct. 01, 2018 USD ($)
Intangible assets, estimated fair value	$ 321,160
In-process Technology [Member]
Indefinite-lived intangible assets, estimated fair value	36,360
Developed Technology Rights [Member]
Finite-lived intangible assets, estimated fair value	$ 194,600
Finite-lived intangible assets, average useful life (Year)	7 years 292 days
Customer Relationships [Member]
Finite-lived intangible assets, estimated fair value	$ 65,890
Finite-lived intangible assets, average useful life (Year)	10 years 219 days
Order or Production Backlog [Member]
Finite-lived intangible assets, estimated fair value	$ 6,410
Finite-lived intangible assets, average useful life (Year)	292 days
Trade Names [Member]
Finite-lived intangible assets, estimated fair value	$ 16,800
Finite-lived intangible assets, average useful life (Year)	11 years
Off-Market Favorable Lease [Member]
Finite-lived intangible assets, estimated fair value	$ 1,100
Finite-lived intangible assets, average useful life (Year)	5 years 182 days