Note 11 Employee Equity Incentive Plans (Tables)

6 Months Ended

Sep. 30, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

		Three Months Ended September 30,				Six Months Ended September 30,
Statement of Operations Classifications			2014		2013		2014		2013
		(unaudited)				(unaudited)
Cost of goods sold		$	102	$	83	$	210	$	249
Research, development and engineering			189		248		378		456
Selling, general and administrative expenses			406		339		790		636
Stock-based compensation effect in income before taxes			697		670		1,378		1,341
Provision for income taxes (1)			244		208		482		416
Net stock-based compensation effects in net income		$	453	$	462	$	896	$	925
________________
(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.

Schedule of Employee Service Share-based Compensation, Fair Value Assumptions and Methodology [Table Text Block]

		Stock Options								Purchase Plan (1)
		Three Months Ended September 30,				Six Months Ended September 30,				Six Months Ended September 30,
			2014		2013		2014		2013		2014		2013
Weighted average estimated fair
	value of grant per share	$	5.54	$	4.95	$	5.54	$	4.95	$	2.90	$	2.60
Risk-free interest rate			1.8%		1.9%		1.8%		1.9%		0.1%		0.1%
Expected term in years			6.25		6.07		6.25		6.07		0.5		0.5
Volatility			52.2%		55.5%		52.2%		55.5%		34.5%		38.5%
Dividend yield			1.0%		0%		1.0%		0%		1.06%		0%
(1)	Under the stock purchase plan, rights to purchase shares are only granted during the first and third quarters of each fiscal year.

Schedule of Share-based Compensation, Stock Options Activity [Table Text Block]

			Weighted Average
		Number of	Exercise Price			Intrinsic Value (1)
		Shares	Per Share
			(unaudited)
						(000)
Balance at March 31, 2014		5,201,635	$	10.22
	Options granted	249,000	$	11.83
	Options exercised	(259,750)	$	8.63	$	1,043
	Options cancelled	(75,250)	$	11.37
	Options expired	(52,500)	$	10.74
Balance at September 30, 2014		5,063,135	$	10.36
Exercisable at September 30, 2014		3,863,385	$	10.12
Exercisable at March 31, 2014		3,865,885	$	10.00
(1)	Represents the difference between the exercise price and the value of our common stock at the time of exercise.