Note 11 Employee Equity Incentive Plans (Tables)

9 Months Ended

Dec. 31, 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 December 31,				Nine Months Ended December 31,
Statement of Operations Classifications			2014		2013		2014		2013
		(unaudited)				(unaudited)
Cost of goods sold		$	110	$	101	$	320	$	350
Research, development and engineering			224		247		602		703
Selling, general and administrative expenses			415		344		1,205		980
Stock-based compensation effect in income before taxes			749		692		2,127		2,033
Provision for income taxes (1)			262		242		744		712
Net stock-based compensation effects in net income		$	487	$	450	$	1,383	$	1,321
________________
(1)	Calculated at the U.S. statutory federal income tax rate of 35% in fiscal 2015 and fiscal 2014.

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,
			2014	2013			2014		2013		2014		2013		2014		2013
		(unaudited)								(unaudited)
Weighted average estimated fair
	value of grant per share		na		na	$	5.54	$	4.95	$	2.90	$	2.94	$	2.90	$	2.75
Risk-free interest rate			na		na		1.8%		1.9%		0.1%		0.1%		0.1%		0.1%
Expected term in years			na		na		6.3		6.1		0.5		0.5		0.5		0.5
Volatility			na		na		52.2%		55.5%		38.7%		35.0%		36.9%		37.0%
Dividend yield			na		na		1.01%		0%		1.05%		0%		1.06%		0%
(1) No stock options were granted during the quarters ended December 31, 2014 and 2013.

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	(313,750)	$	8.59	$	1,231
	Options cancelled	(75,250)	$	11.37
	Options expired	(74,500)	$	11.17
Balance at December 31, 2014		4,987,135	$	10.37
Exercisable at December 31, 2014		3,828,885	$	10.16
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.