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BENEFIT PLANS - Additional information (Details) - USD ($)
3 Months Ended 6 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Oct. 31, 2025
Oct. 31, 2024
BENEFIT PLANS        
Stock-based compensation     $ 219,000 $ 209,000
Weighted-average remaining vesting period     3 years  
Accrued compensation expense related to the deferred stock units     $ 75,000 75,000
Income tax effects   $ 1,230,000   1,230,000
401(k) plan        
BENEFIT PLANS        
Employer contribution $ 36,000 41,000 67,000 63,000
Board of Directors Chairman        
BENEFIT PLANS        
Director compensation non-cash expense 22,000 22,000 45,000 45,000
Equity plan        
BENEFIT PLANS        
Stock-based compensation 85,000 86,000 149,000 139,000
Unrecognized compensation expense related to restricted shares 454,000   $ 454,000  
Equity plan | President and Chief executive officer        
BENEFIT PLANS        
Stock option issued during the year     50,000  
2016 Equity Plan | Board of Directors Chairman        
BENEFIT PLANS        
Non cash compensation expense $ 12,000 $ 12,000 $ 25,000 $ 25,000