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Organization, Use of Estimates and Basis of Presentation (Details)
3 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Common stock equivalents 17,463,122 16,533,122
Employee Stock Option [Member]
   
Common stock equivalents 14,161,455 15,103,955
Warrant [Member]
   
Common stock equivalents 3,276,667 1,416,667
Restricted Stock [Member]
   
Common stock equivalents 25,000 12,500