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Summary of Significant Accounting Policies - Computation of Basic and Diluted Earnings per Share Attributed to Common Stockholders (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Apr. 30, 2025
Apr. 30, 2024
Apr. 30, 2023
Net Loss      
Basic loss $ (77) $ (12,248) $ (12,024)
Effect of dilutive stock awards 0 0 0
Diluted loss $ (77) $ (12,248) $ (12,024)
Shares      
Basic (in shares) 12,806 12,967 13,372
Effect of dilutive stock awards (in shares) 0 0 0
Diluted (in shares) 12,806 12,967 13,372
Per Share Amount      
Basic (in dollars per share) $ (0.01) $ (0.94) $ (0.90)
Diluted (in dollars per share) $ (0.01) $ (0.94) $ (0.90)