Line of Credit (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013 Loans	Mar. 31, 2012 Loans
Line of Credit (Textual) [Abstract]
Credit facility with borrowing capacity	$ 10
Debt Instrument, Basis Spread on Variable Rate	1.50%
Current assets to liabilities ratio	1.25
Debt to tangible net worth	1.25
Fluctuating rate determined by financial institution	Fluctuating rate determined by the financial institution to be 1.50% above the daily one-month LIBOR rate
Debt to tangible net worth not greater than	Debt to tangible net worth not greater than 1.25:1
Number of Outstanding revolving loans at any time during fiscal period	0	0
Letters of credit in aggregate amount	$ 8.0
Renewed credit agreement expiration period	September 2013