Annual report pursuant to Section 13 and 15(d)

SHAREHOLDERS' EQUITY (Details)

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SHAREHOLDERS' EQUITY (Details) - USD ($)
12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares, Outstanding at beginning 1,917 5,090  
Number of shares, Employee options granted 46,363 80  
Number of shares, Expiration (7,592) (3,253)  
Number of shares, Outstanding at ending 40,688 1,917 5,090
Number of shares, Options vested 27,052    
Weighted Average Exercise Price, Outstanding at beginning $ 14.76 $ 147.40  
Weighted Average Exercise Price, Employee options granted 20.06 78.10  
Weighted Average Exercise Price, Expiration 25.52 25.13  
Weighted Average Exercise Price, Outstanding at ending 18.79 $ 14.76 $ 147.40
Weighted Average Exercise Price, Options vested $ 25.82    
Total Intrinsic Value, Outstanding at beginning $ 0 $ 0  
Total Intrinsic Value, Employee options granted 0 0  
Total Intrinsic Value, Expiration 0 0  
Total Intrinsic Value, Outstanding at ending 0 $ 0 $ 0
Total Intrinsic Value, Options vested $ 0    
Weighted Average Remaining Contractual Life, Employee options granted 5 years 1 month 6 days    
Weighted Average Remaining Contractual Life, Expiration      
Weighted Average Remaining Contractual Life, Outstanding 5 years 10 months 17 days 3 years 4 months 2 days 3 years 10 months 17 days
Weighted Average Remaining Contractual Life, Options vested 3 years 11 months 1 day