Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Warrant Activity (Details)

v3.21.2
Stockholders' Equity - Summary of Warrant Activity (Details) - Warrant - USD ($)
3 Months Ended
Jul. 31, 2021
Apr. 30, 2021
Jul. 31, 2021
Number of Shares      
Balance Outstanding, April 30, 2021 (in shares)     374,174
Granted (in shares)     25,000
Warrants exercised (in shares)     0
Surrendered (in shares)     0
Expired (in shares)     0
Balance Outstanding, July 31, 2021 (in shares) 399,174 374,174 399,174
Exercisable, July 31, 2021 (in shares) 374,174 374,174 374,174
Weighted Average Exercise Price      
Balance Outstanding, April 30, 2021 (in dollars per share)     $ 6.37
Granted (in dollars per share)     6.99
Exercised (in dollars per share)     0
Surrendered (in dollars per share)     0
Expired (in dollars per share)     0
Balance Outstanding, July 31, 2021 (in dollars per share) $ 6.41 $ 6.37 6.41
Exercisable, July 31, 2021 (in dollars per share) $ 6.37   $ 6.37
Weighted Average Remaining Contractual Term      
Weighted Average Remaining Contractual Term, Outstanding 1 year 10 months 6 days 1 year 10 months 24 days  
Weighted Average Remaining Contractual Term, Granted     4 years 11 months 23 days
Weighted Average Remaining Contractual Term, Exercisable 1 year 6 months 14 days    
Aggregate Intrinsic Value      
Average Intrinsic Value $ 144,000 $ 0 $ 144,000
Aggregate Intrinsic Value, Exercisable $ 144,000   $ 144,000