Note 7 Goodwill and Intangible Assets (Narratives) (Details) (USD $)				12 Months Ended	0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2012 Zilog Inc [Member]	Jun. 27, 2013 MCU Business [Member]
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Future Amortization Expense, Year One	$ 6,000,000
Future Amortization Expense, Year Two	4,700,000
Future Amortization Expense, Year Three	2,700,000
Future Amortization Expense, Year Four	2,400,000
Future Amortization Expense, Year Five	596,000
Impaired Intangible Assets [Line Items]
Goodwill, Impairment Losses				6,400,000
Goodwill, Impaired, Discount Rate Assumption				20.00%
Goodwill, Impaired, Long-term Growth Rate Assumption				2.00%
Business Acquisition, Effective Date of Acquisition					Jun. 27, 2013
Goodwill	$ 25,164,000	$ 0	$ 0		$ 25,164,000