Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Tables)

v3.5.0.2
Stock-Based Compensation (Tables)
12 Months Ended
Apr. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Bonus shares activity table
    Shares     Weighted
average
exercise
price
    Weighted
average
remaining
contractual life
    Aggregate
intrinsic
value (1)
 
Balance April 30, 2014     81,859     $ 36.81       4.46     $ 6,250  
                                 
Granted                        
Exercised                        
Expired     (39,944 )   $ 48.72              
                                 
Balance May 1, 2015     41,915     $ 25.44       3.59     $  
                                 
Granted     79,556     $ 4.89              
Expired     (12,444 )   $ 38.13              
Exchanged / cancelled     (109,027 )   $ 9.03              
Balance April 30, 2016                     $  
Weighted-average Black-Scholes assumptions
  Fiscal Year Ended
April 30, 2016
Expected term (years) 2.5-3.0
Expected volatility 79%-80%
Dividend yield 0
Risk-free interest rate .90% -1.01%
Weighted average per share grant date fair value $2.34 - $3.09
Summary of warrant activity
    Shares     Weighted
average
exercise
price
    Weighted
average
remaining
contractual life years
    Aggregate
intrinsic
value (1)
 
Balance May 1, 2014     161,925     $ 24.27       3.34        
                                 
Issued     940,833     $ 7.88                
Exchanged                            
Expired                            
Balance April 30, 2015     1,102,758     $ 10.56       4.12        
                                 
Issued     16,667     $ 7.50                
Exchanged     (881,800 )   $ 8.10                  
Expired     (30,000 )   $ 7.50                  
Balance April 30, 2016     207,625     $ 19.74       1.24