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BENEFIT PLANS - Additional information (Details) - USD ($)
 1 Months Ended 12 Months Ended
Nov. 30, 2021
Apr. 30, 2025
Apr. 30, 2024
Apr. 30, 2023
BENEFIT PLANS        
Actuarial gain     $ 126,000  
Stock-based compensation   $ 423,000 $ 317,000  
Weighted-average remaining vesting period   3 years    
Stock option issued during the year   16,140 16,400  
Accrued compensation expense related to the deferred stock units   $ 30,000 $ 30,000  
Percentage of options exercisable 100.00%      
Asset allocation for the pension plan by asset category 100.00%      
Threshold period after ceases from employment on account of disability for automatic termination of options 1 year      
Threshold period after ceases from employment on account of death for automatic termination of options 1 year      
Term of options from the date of grant 10 years      
Threshold period after ceases from employment for automatic termination of options 3 months      
Fair value of options $ 252,000      
Expected volatility 38.04%      
Average risk-free interest rate 1.46%      
Dividend yield 0.00%      
Expected life 7 years 6 months      
Pbgc        
BENEFIT PLANS        
Lump sum payouts of pension benefits to former employees     0  
Pension plan        
BENEFIT PLANS        
Amount of residual assets   547,000    
401(k) plan        
BENEFIT PLANS        
Contributions utilized   92,000 92,000  
Employer contribution   $ 39,000 10,000  
Simple IRA plan        
BENEFIT PLANS        
Company contributions     $ 88,000  
Defined contribution plan, maximum contribution percentage   3.00% 3.00%  
Board of Directors Chairman        
BENEFIT PLANS        
Director compensation non-cash expense   $ 90,000 $ 90,000  
Shares Issued, Price Per Share     $ 31.4  
Equity plan        
BENEFIT PLANS        
Stock-based compensation   311,000 $ 237,000  
Unrecognized compensation expense related to restricted shares   $ 287,000    
Equity plan | President and Chief executive officer        
BENEFIT PLANS        
Stock option issued during the year 50,000      
Exercise price $ 14.24      
2016 Equity Plan        
BENEFIT PLANS        
Number of common stock issued under the equity plan   141,501    
Shares reserved for issuance   117,226    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   500,000    
Non-vested   241,273    
2016 Equity Plan | Board of Directors Chairman        
BENEFIT PLANS        
Non cash compensation expense   $ 50,000 50,000  
Non Cash Director Compensation     $ 30,000 $ 30,000
Shares Issued, Price Per Share       $ 21.97
Stock Issued During Period, Shares, Restricted Stock Award, Gross     2,865 4,095