Note 10 Employee Equity Incentive Plans (Option Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2012		Mar. 31, 2011
Options Outstanding Intrinsic Value [Abstract]
Aggregate Intrinsic Value, Outstanding	$ 8,658		$ 4,273		$ 19,532		$ 23,505
Aggregate Intrinsic Value, Exercised	$ 1,695	[1]	$ 443	[1]	$ 2,862	[1]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant [Roll Forward]
Beginning Balance	299,947		748,036		1,102,786	[2]
New Shares Authorized	2,000,000	[3]			600,000	[4]
Options Granted	(515,000)		(455,000)		(966,000)
Plan Authorization Expired	(47,963)		(589)
Options Cancelled	24,000		7,500		11,250
Options Expired	17,500
Ending Balance	1,778,484		299,947		748,036
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Share-based Payment Award, Number of Shares Available for Grant	1,778,484		299,947		748,036
Market Price of Company Stock	$ 11.35
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Shares Issued	151,766
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning Balance	5,327,473		5,472,004		5,199,768
Options Granted	515,000		455,000		966,000
Options Exercised	(572,338)	[5]	(153,131)	[5]	(478,264)	[5]
Options Cancelled	(34,000)		(67,425)		(164,500)
Options Expired	(34,500)		(378,975)		(51,000)
Ending Balance	5,201,635		5,327,473		5,472,004
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price Per Share (Options Outstanding)	$ 10.22		$ 10.04		$ 9.75		$ 9.03
Options Granted	$ 10.63		$ 9.93		$ 12.37
Options Exercised	$ 8.72		$ 7.03		$ 7.35
Options Cancelled	$ 11.42		$ 8.34		$ 8.30
Options Expired	$ 12.62		$ 7.31		$ 12.61

[1] Except for option exercised, these amounts represents the difference between the exercise price and $11.35 per share, the closing price of our stock on March 31, 2014 as reported on the NASDAQ Global Select Market, for all in-the-money, outstanding and exercisable options.

[2] Reflects the issuance of 151,766 restricted stock units prior to March 31, 2011.

[3] On August 30, 2013, our stockholders approved the 2013 Plan, under which 2,000,000 shares of our common stock are reserved for the grant of stock options.

[4] On September 16, 2011, our stockholders approved the 2011 Plan, under which 600,000 shares of our common stock are reserved for the grant of stock options.

[5] The number of stock option exercised includes shares that were withheld on behalf of employees to satisfy the statutory tax withholding requirements.