Revolving Credit Facility (Details Textual) (USD $) In Millions, unless otherwise specified	1 Months Ended	6 Months Ended		1 Months Ended
	Jan. 31, 2011	Jul. 31, 2012	Jul. 31, 2012 Revolving Credit Facility [Member]	Apr. 30, 2012 T D Bank [Member]	Jan. 31, 2010 T D Bank [Member]
Line of Credit Facility, Amount Outstanding			$ 9.1		$ 23.5
Line of Credit Facility, Increase, Additional Borrowings	$ 6.5	$ 9.5		$ 3.0
Line Of Credit Facility Expiration Date1		Jun. 30, 2014