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EARNINGS PER SHARE - Earnings per share - Diluted (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Jul. 31, 2024
Jul. 31, 2023
Numerator:    
Net Income (Loss) $ 4,064 $ 1,346
Denominator:    
Weighted average number of common shares outstanding - basic (in shares) 5,309 5,292
Dilutive effect of shares of restricted common stock 29 27
Dilutive effect of shares issuable upon the exercise of stock options that are in-the-money 15 6
Weighted average number of common shares outstanding - diluted (in shares) 5,353 5,325
Earnings per share - diluted (in dollars per share) $ 0.76 $ 0.25