Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Stock Option Activity (Details)

v3.22.2.2
Stockholders' Equity - Summary of Stock Option Activity (Details) - USD ($)
3 Months Ended
Jul. 31, 2022
Apr. 30, 2022
Jul. 31, 2022
Number of Shares      
Balance Outstanding, July 31, 2022 (in shares) 795,182   795,182
Exercisable, July 31, 2022 (in shares) 786,549   786,549
Employees And Directors | Stock options | Stock Incentive Plan      
Number of Shares      
Balance Outstanding, April 30, 2022 (in shares)     860,182
Granted (in shares)     0
Exercised (in shares)     0
Forfeited (in shares)     (36,000)
Expired (in shares)     (29,000)
Balance Outstanding, July 31, 2022 (in shares) 795,182 860,182 795,182
Exercisable, July 31, 2022 (in shares) 786,549   786,549
Weighted Average Exercise Price      
Balance Outstanding, April 30, 2022 (in dollars per share)     $ 7.03
Granted (in dollars per share)     0
Exercised (in dollars per share)     0
Forfeited (in dollars per share)     8.98
Expired (in dollars per share)     4.19
Balance Outstanding, July 31, 2022 (in dollars per share) $ 7.05 $ 7.03 7.05
Exercisable, July 31, 2022 (in dollars per share) $ 7.05   $ 7.05
Stock Option Activity, Additional Disclosures      
Options outstanding, weighted average remaining contractual term 1 year 25 days 1 year 3 months  
Options exercisable, weighted average remaining contractual term 1 year 21 days    
Options outstanding, aggregate intrinsic value $ 0 $ 0 $ 0
Options exercisable, aggregate intrinsic value $ 0   $ 0