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Net Loss Per Common Share (Tables)
12 Months Ended
Apr. 30, 2019
Earnings Per Share [Abstract]  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

 

    April 30, 2019     April 30, 2018  
Common stock equivalents:                
Stock options     1,456,458       1,531,458  
Stock warrants     1,702,359       1,702,359  
Total     3,158,817       3,233,817