Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Schedule of Warrants) (Details)

v3.19.2
Stockholders' Equity (Schedule of Warrants) (Details) - Warrant [Member] - USD ($)
3 Months Ended 12 Months Ended
Jul. 31, 2019
Apr. 30, 2019
Number of Shares    
Balance Outstanding, April 30, 2019 731,152  
Granted  
Exercised (43,860)  
Surrendered  
Expired  
Balance Outstanding, July 31, 2019 687,292 731,152
Exercisable, July 31, 2019 637,292  
Weighted Average Exercise Price    
Balance Outstanding, April 30, 2019 $ 5.28  
Granted  
Exercised  
Surrendered  
Expired  
Balance Outstanding, July 31, 2019 5.47 $ 5.28
Exercisable, July 31, 2019 $ 5.52  
Weighted Average Remaining Contractual Term    
Balance Outstanding, April 30, 2019 3 years 2 months 27 days 3 years 3 months 15 days
Exercisable, July 31, 2019 3 years 1 month 16 days  
Aggregate Intrinsic Value    
Balance Outstanding, April 30, 2019 $ 413,296  
Balance Outstanding, July 31, 2019 244,286 $ 413,296
Exercisable, July 31, 2019 $ 244,286