Financing Arrangements (Details) (USD $)	9 Months Ended
	Oct. 31, 2013	Jan. 31, 2013	Oct. 31, 2012
Debt Disclosure [Abstract]
Borrowing capacity under line of credit	$ 10,500,000
Maturity date of the line of credit	Nov. 30, 2014
Line of credit prime interest rate percentage	1.50%
Description of variable rate basis	one-month London Inter-bank Market Rate
Letters of credit issued, amount	850,000
Borrowing outstanding under line of credit	0	0	0
Remaining borrowing capacity under the line of credit	$ 9,650,000