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Note 8 - Shareholders' Equity (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 30, 2017
Accumulated Other Comprehensive Income (Loss), Pension and Other Post-retirement Benefit Plans, Liability Adjustment Tax	$ 0.2	$ 1.4
Accounting Standards Update 2016-01 [Member]
Cumulative Effect on Retained Earnings, Net of Tax, Total	$ 9.8
IXYS Corporation [Member]
Stock Issued During Period, Shares, Acquisitions	2,092,491

X

- Definition

Represents accumulated Other Comprehensive Income (Loss), Pension and Other Post-retirement Benefit Plans, Liability Adjustment Tax.

+ References

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- Definition

Amount of the cumulative effect on retained earnings net of related income tax effect.

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