Quarterly report pursuant to Section 13 or 15(d)

Securities Purchase Agreements Statement of Stockholders' Equity (Details)

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Securities Purchase Agreements Statement of Stockholders' Equity (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2014
Jan. 31, 2013
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Beginning balance     $ 2,990,272        
Net loss (846,786) (781,663) (2,066,608) (3,005,137) (4,625,000) (3,259,000) (4,634,000)
Stock based compensation expense     43,399        
Ending balance 1,662,554   1,662,554   2,990,272    
Common Stock
              
Beginning balance (shares)     1,754,662        
Beginning balance     1,754,662        
Issuance of shares under registered direct offering (shares)     350,000        
Issuance of shares under registered direct offering     350,000        
Ending balance (shares) 2,104,662   2,104,662        
Ending balance 2,104,662   2,104,662        
Additional Paid-In Capital
              
Beginning balance     19,287,931        
Issuance of shares under registered direct offering     345,491        
Stock based compensation expense     43,399        
Ending balance 19,676,821   19,676,821        
Retained Earnings (Accumulated Deficit)
              
Beginning balance     (18,052,321)        
Net loss     (2,066,608)        
Ending balance $ (20,118,929)   $ (20,118,929)