Goodwill (Details) (USD $)	6 Months Ended
	Jul. 31, 2012
Balance as of January 31, 2012	$ 6,132,954
During fiscal year 2013 through April 30, 2012
Effect of foreign currency translation	(636,397)
Balance as of July 30, 2012	5,496,557
USA [Member]
Balance as of January 31, 2012	871,297
During fiscal year 2013 through April 30, 2012
Effect of foreign currency translation	0
Balance as of July 30, 2012	871,297
Brazil [Member]
Balance as of January 31, 2012	5,261,657
During fiscal year 2013 through April 30, 2012
Effect of foreign currency translation	(636,397)
Balance as of July 30, 2012	$ 4,625,260