Line of Credit (Details) (USD $)	12 Months Ended
	Mar. 31, 2013
Line of Credit Facility [Abstract]
Borrowing capacity of line of credit	$ 15,000,000
Line of credit facility, expiration date	Dec. 31, 2014
Basis spread percentage on line of credit	2.00%
Line of credit facility unused capacity commitment fee %	0.20%
Line of credit facility maximum letters of credit outstanding	1,000,000
Outstanding letters of credit	300,000
Amount outstanding under line of credit	$ 0