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Securities Purchase Agreements (Tables)
3 Months Ended
Oct. 31, 2013
Stockholders' equity:  
Statement of Stockholder's Equity
   Number of
Common
Shares
   Common
Stock
   Additional
Paid-In
Capital
   Accumulated
Deficit
   Total
Stockholders’
Equity
 
Balance at April 30, 2013   1,754,662   $1,754,662   $19,287,931   $(18,052,321)  $2,990,272 
Issuance of shares under Registered Direct Offering   350,000    350,000    345,491         695,491 
Net loss                  (1,219,822)   (1,219,822)
Stock-based compensation expense             38,682         38,682 
Balance at October 31, 2013   2,104,662   $2,104,662   $19,672,104   $(19,272,143)  $2,504,623