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Note 12 - Segment Information (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)	Apr. 01, 2017 USD ($)
Number of Operating Segments	3
Inventory Charge Related to Step-up in Cost Basis	$ 17,896
IXYS Corporation [Member]
Business Combination, Acquisition Related Costs	38,600
Inventory Charge Related to Step-up in Cost Basis	17,900
Selling, General and Administrative Expenses [Member] | IXYS Corporation [Member]
Business Combination, Acquisition Related Costs	10,200
Other Segments [Member]
Restructuring Charges, Total	800
Other Segments [Member] | IXYS Corporation [Member]
Inventory Charge Related to Step-up in Cost Basis	17,900
Other Segments [Member] | Operating Income (Loss) [Member]
Business Combination, Acquisition Related Costs	39,500
Other Segments [Member] | Cost of Sales [Member]
Restructuring Charges, Total	500
Other Segments [Member] | Cost of Sales [Member] | IXYS Corporation [Member]
Business Combination, Acquisition Related Costs	18,400
Other Segments [Member] | Selling, General and Administrative Expenses [Member]
Business Combination, Acquisition Related Costs		$ 1,500
Restructuring Charges, Total	300
Other Segments [Member] | Selling, General and Administrative Expenses [Member] | IXYS Corporation [Member]
Business Combination, Acquisition Related Costs	16,100
Other Segments [Member] | Selling, General and Administrative Expenses [Member] | All 2017 Acquisitions [Member]
Business Combination, Acquisition Related Costs	100
Other Segments [Member] | Research and Development Expense [Member] | IXYS Corporation [Member]
Business Combination, Acquisition Related Costs	1,600
Other Segments [Member] | Backlog Amortization Expense [Member] | IXYS Corporation [Member]
Business Combination, Acquisition Related Costs	$ 2,500

X

- Definition

The aggregate expense charged against earnings to allocate the cost of inventory previously stepped-up in cost basis in a business acquisition.

+ References

No definition available.

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X

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460

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X

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

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X

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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