Note 11 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, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Mar. 31, 2015	Mar. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based Compensation Effect in Income before Taxes	$ 697		$ 670		$ 1,378		$ 1,341
Provision for Income Taxes	244	[1]	208	[1]	482	[1]	416	[1]
Net Stock-based Compensation Effects on Net Income	453		462		896		925
Estimated Statutory Income Tax Rate									35.00%	31.00%
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	102		83		210		249
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	189		248		378		456
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	$ 406		$ 339		$ 790		$ 636

[1] Calculated at the U.S. statutory federal income tax rate of 35% in fiscal 2015 and an estimated income tax rate of 31% in fiscal 2014.