Annual report pursuant to Section 13 and 15(d)

SHAREHOLDERS' EQUITY (Details 2)

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SHAREHOLDERS' EQUITY (Details 2) - $ / shares
 12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Class of Stock [Line Items]    
Number of Warrants, Common Stock Warrants Outstanding Beginning Balance 171,582 103,400
Number of Warrants, BTX Warrants issued in connection with the BTX Purchase Agreement   68,182
Number of Warrants, Warrants exchanged in connection with the Amendment (156,072)  
Number of Warrants, Common Stock Warrants Outstanding Ending Balance 15,510 171,582
Weighted Average Exercise Price, Common Stock Warrants Outstanding Beginning Balance $ 72.27 $ 47.39
Weighted Average Exercise Price, BTX Warrants issued in connection with the BTX Purchase Agreement   110.00
Weighted Average Exercise Price, Exchange Warrants issued in connection with the Amendment 47.39  
Weighted Average Exercise Price, Common Stock Warrants Outstanding Ending Balance $ 322.64 $ 72.27
Weighted Average Remaining Life in years, Common Stock Warrants Contractual Term   4 years 6 months
Weighted Average Exercise Price, BTX Warrants issued in connection with the BTX Purchase Agreement   4 years
Common Stock Warrants Exchanged In Connection With Amendment    
Weighted Average Remaining Life in years, Common Stock Warrants Contractual Term 4 years 4 days 4 years