Share Based Awards (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended			3 Months Ended										3 Months Ended		3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2012	Jun. 30, 2012 Employee Stock Option [Member] Y	Jun. 30, 2012 Restricted Stock Units Award [Member] Y	Jun. 30, 2011 Restricted Stock Units Award [Member]	Jun. 30, 2012 Employee Option [Member]	Jun. 30, 2011 Employee Option [Member]	Jun. 30, 2012 Director Options [Member]	Jun. 30, 2011 Director Options [Member]	May 24, 2012 Performance Based Award [Member]	May 24, 2012 Performance Based Award [Member] Executive Officer [Member]	May 24, 2012 Performance Based Award [Member] Non Executive Employees [Member]	Jun. 30, 2012 Nineteen Ninety Eight Plan [Member]	Sep. 30, 1998 Nineteen Ninety Eight Plan [Member]	Jun. 30, 2012 Two Thousand Five Stock Options Plan [Member]	Oct. 31, 2005 Two Thousand Five Stock Options Plan [Member]
Share Based Awards (Textual) [Abstract]
Common stock reserved															8,000,000		4,800,000
Expiration date of options under 1998 Plan														10 years		10 years
Outstanding options under 1998 and 2005 plan	1,432,471		988,337											40,000		1,392,471
Shares available for future grants											600,000					2,770,310
Weighted-average grant date fair value per share of stock options	$ 8.56	$ 13.32
Annualized forfeiture rate for employee options							3.80%	3.30%	0.00%	0.00%
Options granted under 2005 plan	491,500
Maximum number of options available under the equity incentive program												220,000	380,000
Stock compensation related to the performance based award	$ 111	$ 213
Total unrecognized compensation costs				8,876	662
Stock option recognized over weighted average period (in years)				3.8	1.7
Fair value of options vested	1,284	764
Restricted units issued					59,792
Compensation expense	$ 964	$ 956			$ 147	$ 103