Financing Arrangement (Details) (USD $)	3 Months Ended	12 Months Ended
	Apr. 30, 2013	Jan. 31, 2013
Financing Arrangements (Textual) [Abstract]
Maximum borrowing amount of revolving loan	$ 4,250,000
Interest rate on borrowings under the line of credit.	LIBOR plus 2.25%
Interest rate	2.25%
Maximum borrowing amount limit of letter of credit	10,000,000
Borrowings outstanding under bank financing arrangements	$ 0	$ 0
Expiration date of financing arrangements	May 31, 2013
Ratio of total funded debt to EBITDA	2	2
Fixed charge coverage ratio	1.25	1.25
Ratio of senior funded debt to EBITDA	1.50	1.50