Share Based Awards (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended									6 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Mar. 31, 2012	Sep. 30, 2012 Employee Stock Option [Member] Y	Sep. 30, 2012 Restricted Stock Units Award [Member]	Sep. 30, 2012 Restricted Stock Units Award [Member] Y	Sep. 30, 2011 Restricted Stock Units Award [Member]	Sep. 30, 2012 Employee Option [Member]	Sep. 30, 2011 Employee Option [Member]	Sep. 30, 2012 Director Options [Member]	Sep. 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]	Sep. 30, 2012 Nineteen Ninety Eight Plan [Member]	Sep. 30, 1998 Nineteen Ninety Eight Plan [Member]	Sep. 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	1,296,591		1,296,591		988,337												40,000		1,256,591
Shares available for future grants														600,000					2,887,747
Weighted-average grant date fair value per share of stock options			$ 8.41	$ 13.32
Annualized forfeiture rate for employee options										5.80%	3.80%	0.00%	0.00%
Options granted under 2005 plan			511,500
Maximum number of options available under the equity incentive program															220,000	380,000
Stock compensation related to the performance based award				$ 345
Total unrecognized compensation costs						7,380	811	811
Stock option recognized over weighted average period (in years)						3.8		2.2
Fair value of options vested	1,270			1,111
Restricted units issued							78,235
Compensation expense	$ 419	$ 705	$ 1,383		$ 1,661			$ 324	$ 246