Note 6 Goodwill and Intangible Assets (Narratives) (Details) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011 Leadis [Member]	Mar. 31, 2012 Zilog Inc [Member]
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Future Amortization Expense, Year One	$ 989,000
Future Amortization Expense, Year Two	989,000
Future Amortization Expense, Year Three	908,000
Future Amortization Expense, Year Four	6,000
Future Amortization Expense, Year Five	1,000
Impaired Intangible Assets [Line Items]
Goodwill, Impairment Losses	$ 0	$ (6,448,000)	$ (304,000)	$ (6,400,000)
Goodwill, Impaired, Method for Fair Value Determination	We performed our annual impairment review based on the declining business outlook of the reporting unit. The material assumptions used for the income approach were five years of projected net cash flows, a discount rate of 20% and a long-term growth rate of 2%. We considered historical rates and current market conditions to determine the discount and growth rates for the analysis.
Goodwill, Impaired, Discount Rate Assumption				20.00%
Goodwill, Impaired, Long-term Growth Rate Assumption				2.00%