Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Warrant Activity (Details)

v3.22.2.2
Stockholders' Equity - Summary of Warrant Activity (Details) - Warrant - USD ($)
 3 Months Ended
Jul. 31, 2022
Apr. 30, 2022
Jul. 31, 2022
Number of Shares      
Balance Outstanding, April 30, 2022 (in shares)     649,174
Granted (in shares)     0
Exercised (in shares)     0
Surrendered (in shares)     0
Expired (in shares)     (224,174)
Balance Outstanding, July 31, 2022 (in shares) 425,000 649,174 425,000
Exercisable, July 31, 2022 (in shares) 400,000   400,000
Weighted Average Exercise Price      
Balance Outstanding, April 30, 2022 (in dollars per share)     $ 4.70
Granted (in dollars per share)     0
Exercised (in dollars per share)     0
Surrendered (in dollars per share)     0
Expired (in dollars per share)     6.87
Balance Outstanding, July 31, 2022 (in dollars per share) $ 4.70 $ 4.70 4.70
Exercisable, July 31, 2022 (in dollars per share) $ 4.89   $ 4.89
Weighted Average Remaining Contractual Term      
Weighted Average Remaining Contractual Term, Outstanding 1 year 11 months 15 days 1 year 11 months 15 days  
Weighted Average Remaining Contractual Term, Exercisable 1 year 9 months 18 days    
Aggregate Intrinsic Value      
Average Intrinsic Value $ 0 $ 0 $ 0
Aggregate Intrinsic Value, Exercisable $ 0   $ 0