Note 12 Employee Equity Incentive Plans (Allocated Share-based Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended				12 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012		Mar. 31, 2014	Mar. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based Compensation Effect in Income before Taxes	$ 670		$ 1,036		$ 1,341		$ 2,131
Provision for Income Taxes	208	[1]	363	[1]	416	[1]	746	[1]
Net Stock-based Compensation Effects on Net Income	462		673		925		1,385
Estimated Statutory Income Tax Rate									31.00%	35.00%
Cost of Goods Sold [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based Compensation Effect in Income before Taxes	83		113		249		230
Research, Development and Engineering [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based Compensation Effect in Income before Taxes	248		283		456		564
Selling, General and Administrative Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based Compensation Effect in Income before Taxes	$ 339		$ 640		$ 636		$ 1,337

[1] Estimated at a statutory income tax rate of 31% in fiscal year 2014 and 35% in fiscal year 2013.