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Share Based Awards (Tables)
12 Months Ended
Apr. 30, 2021
Share-based Payment Arrangement [Abstract]  
Assumptions used for estimating fair value of options
   2021  2020
Exercise price   2.01 - 3.95    0.82 - 2.10 
Stock price on date of grant   2.01 - 3.95    0.82 - 2.10 
Volatility   88.60% - 91.44%   75%
Risk-free interest rate   0.38% - 1.66%   1.59 - 1.74%
Expected term (years)   5.87 - 10.00    5.00 - 10.00 
Dividend yield   —      —   
Summary of activity under 2019 Equity Incentive Plan
Options  Shares  Weighted-Average Exercise Price  Weighted-Average Remaining Contractual Term  Aggregate Intrinsic Value
                     
Outstanding as of April 30, 2019   —      —             
Granted   1,597,475   $1.10           
Exercised   —      —             
Forfeited or expired   —      —             
Outstanding as of April 30, 2020   1,597,475    1.10           
Granted   600,000    3.63           
Exercised   —      —             
Forfeited or expired   —      —             
Outstanding as of April 30, 2021   2,197,475   $1.79    8.68   $4,943,870 
Exercisable as of April 30, 2021   1,305,810   $2.21    9.00   $2,388,208 
Stock compensation expense
   2021  2020
General and administrative  $1,688,025   $213,959 
Research and development   1,269,987    55,936 
Operations   220,048    —   
Sales and marketing   210,156    —   
 Total  $3,388,216   $269,895