Note 12 Employee Equity Incentive Plans (Tables)

9 Months Ended

Dec. 31, 2013

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 December 31,				Nine Months Ended December 31,
Statement of Operations Classifications			2013		2012		2013		2012
		(unaudited)				(unaudited)
Cost of goods sold		$	101	$	88	$	350	$	318
Research, development and engineering			247		252		703		815
Selling, general and administrative expenses			344		386		980		1,724
Stock-based compensation effect in income before taxes			692		726		2,033		2,857
Provision for income taxes (1)			242		254		712		1,000
Net stock-based compensation effects in net income		$	450	$	472	$	1,321	$	1,857
________________
(1)	Estimated at an income tax rate of 35% in fiscal 2014 and fiscal 2013.

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

		Stock Options (1)								Purchase Plan
		Three Months				Nine Months				Three Months				Nine Months
		Ended December 31,				Ended December 31,				Ended December 31,				Ended December 31,
			2013	2012			2013		2012		2013		2012		2013		2012
Weighted average estimated fair
	value of grant per share	$	na	$	na	$	4.95	$	5.21	$	2.94	$	2.81	$	2.75	$	3.22
Risk-free interest rate			na		na		1.9%		1.0%		0.1%		0.1%		0.1%		0.2%
Expected term in years			na		na		6.1		6.3		0.5		0.5		0.5		0.5
Volatility			na		na		55.5%		55.4%		35.0%		46.0%		37.0%		46.4%
Dividend yield			na		na		0%		0%		0%		0%		0%		0%
(1) No stock options were granted during the quarters ended December 31, 2013 and 2012.

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

			Weighted Average
		Number of	Exercise Price			Intrinsic Value (1)
		Shares	Per Share
						(000)
Balance at March 31, 2013		5,327,473	$	10.04
	Options granted	239,000	$	9.27
	Options exercised	(323,050)	$	7.87	$	1,168
	Options cancelled	(34,000)	$	11.42
	Options expired	(6,500)	$	9.96
Balance at December 31, 2013		5,202,923	$	10.13
Exercisable at December 31, 2013		4,061,923	$	10.00
Exercisable at March 31, 2013		4,065,473	$	9.74
(1)	Represents the difference between the exercise price and the value of our common stock at the time of exercise.