Stock-Based Compensation (Schedule Of Option Activity) (Details) (USD $)	3 Months Ended
	Jun. 30, 2012
Stock-Based Compensation Schedule Of Option Activity Details
Balance at March 31, 2012	6,034,335
Granted - options	38,000
Stock purchase rights (1)	0	[1]
Exercised	(19,448)
Cancelled/forfeited	(57,410)
Termination of plans	0
Balance at June 30, 2012	5,995,477
Shares available for grant, March 31, 2012	375,546
Granted shares available for grant	(38,000)
Stock purchase rights shares available for grant	(52,500)	[1]
Exercised shares available for grant	0
Cancelled/forfeited shares available for grant	57,410
Termination of plans shares available for grant	(40,701)
Shares available for grant, June 30, 2012	301,755
Weighted-average exercise price of options outstanding, March 31, 2012	$ 1.90
Weighted-average exercise price of options granted during period	$ 4.19
Weighted-average exercise price of options exercised during the period	$ 1.59
Weighted-average exercise price of options forfeited, cancelled or expired during the period	$ 4.47
Weighted-average exercise price of options termination of plans during period	$ 0
Weighted-average exercise price of options outstanding, June 30, 2012	$ 1.89

[1] The reduction to shares available for grant includes awards granted of 52,500 shares