Note 6 Goodwill and Intangible Assets (Acquired Intangibles) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Method	straight-line
Zilog Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition Date Fair Value	14,000
Developed Intellectual Property [Member] | Zilog Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition Date Fair Value	4,800
Finite-Lived Intangible Assets, Amortization Method	Straight-line
Acquired Finite-lived Intangible Asset, Estimated Useful Life	72 years
Customer Relationships [Member] | Zilog Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition Date Fair Value	6,100
Finite-Lived Intangible Assets, Amortization Method	Accelerated
Acquired Finite-lived Intangible Asset, Estimated Useful Life	37 years
Contract Backlog [Member] | Zilog Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition Date Fair Value	2,000
Finite-Lived Intangible Assets, Amortization Method	Straight-line
Acquired Finite-lived Intangible Asset, Estimated Useful Life	12 years
Trade Names [Member] | Zilog Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition Date Fair Value	1,100
Finite-Lived Intangible Assets, Amortization Method	Straight-line
Acquired Finite-lived Intangible Asset, Estimated Useful Life	72 years