Note 11 Employee Equity Incentive Plans (Allocated Share-based Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended				12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2014		Dec. 31, 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	$ 749		$ 692		$ 2,127		$ 2,033
Provision for Income Taxes	262	[1]	242	[1]	744	[1]	712	[1]
Net Stock-based Compensation Effects on Net Income	487		450		1,383		1,321
Estimated Statutory Income Tax Rate									35.00%	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	110		101		320		350
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	224		247		602		703
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	$ 415		$ 344		$ 1,205		$ 980

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