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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, 2025
Jul. 31, 2024
Numerator:    
Net Income (Loss) $ 4,692 $ 4,064
Denominator:    
Weighted average number of common shares outstanding - basic (in shares) 5,326 5,309
Dilutive effect of shares of restricted common stock 31 29
Dilutive effect of shares issuable upon the exercise of stock options that are in-the-money 18 15
Weighted average number of common shares outstanding - diluted (in shares) 5,375 5,353
Earnings per share - diluted (in dollars per share) $ 0.87 $ 0.76