Note 3 Business Combinations (Narratives) (Details) (USD $)	6 Months Ended		0 Months Ended	12 Months Ended	3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Jun. 27, 2013 MCU Business [Member] N	Mar. 31, 2014 MCU Business [Member]	Sep. 30, 2014 Other Acquisition [Member]	Jun. 30, 2014 Other Acquisition [Member]
Business Acquisition [Line Items]
Business Acquisition, Name of Acquired Entity			System LSI Division of Samsung Electronics Co., Ltd.
Business Acquisition, Description of Acquired Entity			The acquired product line includes microcontrollers potentially useful in a number of applications, which have to date been principally used in consumer product applications.
Business Combination, Reason for Business Combination			The acquisition was intended to bolster our product portfolio and empower customers to utilize products from across our multiple product lines.
Business Acquisition, Effective Date of Acquisition			Jun. 27, 2013
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net			$ 50,000,000
Payments to Acquire Businesses, Net of Cash Acquired	2,297,000	20,000,000	20,000,000			2,297,000
Business Acquisition, Cost of Acquired Entity, Deferred Payments, Total			30,000,000
Business Acquisition, Cost of Acquired Entity, Deferred Payments, Each Installment			15,000,000
Business Acquisition, Cost of Acquired Entity, Deferred Payments, Number of Installment Payments			2
Business Acquisition, Cost of Acquired Entity, Due Date of First Installment Payment			Jun. 26, 2014
Business Acquisition, Cost of Acquired Entity, Due Date of Second Installment Payment			Dec. 31, 2014
Business Acquisition, Cost of Acquired Entity, Deferred Payments, Description of Variable Rate Basis			six-month LIBOR
Business Acquisition, Cost of Acquired Entity, Deferred Payments, Basis Spread on Variable Rate			3.00%
Business Combination Acquisition Related Costs				403,000
Goodwill, Acquired During Period			25,164,000		2,800,000
Loans Assumed from Business Acquisition					723,000
Goodwill, Translation Adjustments					(196,000)
Goodwill, Purchase Accounting Adjustments					$ 17,000