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Goodwill (Details) (USD $)
 9 Months Ended
Oct. 31, 2012
Balance as of January 31, 2012 $ 6,132,954
During fiscal year 2013 through October 31, 2012  
Effect of foreign currency translation (603,791)
Balance as of October 31, 2012 5,529,163
USA [Member]
  
Balance as of January 31, 2012 871,297
During fiscal year 2013 through October 31, 2012  
Effect of foreign currency translation 0
Balance as of October 31, 2012 871,297
Brazil [Member]
  
Balance as of January 31, 2012 5,261,657
During fiscal year 2013 through October 31, 2012  
Effect of foreign currency translation (603,791)
Balance as of October 31, 2012 $ 4,657,866