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BENEFIT PLANS - Additional information (Details) - USD ($)
 1 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Nov. 30, 2021
Apr. 30, 2024
Apr. 30, 2023
Apr. 30, 2022
BENEFIT PLANS            
Defined benefit plan, fair value of plan assets       $ 747,000 $ 1,030,000 $ 18,054,000
Defined benefit plan, benefit obligation         283,000 $ 17,964,000
Stock-based compensation       $ 317,000 $ 238,000  
Weighted-average remaining vesting period       3 years    
Stock option issued during the year       16,400 14,600  
Percentage of options exercisable     100.00%      
Accrued compensation expense related to the deferred stock units       $ 30,000 $ 30,000  
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      
Settlement and related expenses         7,597,000  
Actuarial gain       126,000 1,667,000  
Other comprehensive income       60,000 5,743,000  
Employer contribution       10,000    
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 0  
Settlement and related expenses         7,597,000  
Pension plan            
BENEFIT PLANS            
Amount of residual assets       547,000    
Accrued pension costs         747,000  
Simple internal revenue code retirement plan            
BENEFIT PLANS            
Company contributions       $ 88,000 74,000  
Defined contribution plan, maximum contribution percentage       3.00%    
Board of Directors Chairman            
BENEFIT PLANS            
Director compensation non-cash expense       $ 90,000 $ 90,000  
Shares Issued, Price Per Share $ 21.97          
Weighted average            
BENEFIT PLANS            
Discount rate         3.97%  
Equity plan            
BENEFIT PLANS            
Stock-based compensation       237,000 $ 144,000  
Unrecognized compensation expense related to restricted shares       $ 183,000    
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            
Vested       500,000    
Number of common stock issued under the equity plan       125,361    
Shares reserved for issuance       114,361    
Non-vested       260,278    
2016 Equity Plan | Board of Directors Chairman            
BENEFIT PLANS            
Non cash compensation expense       $ 50,000 $ 51,000  
Non Cash Director Compensation $ 30,000 $ 30,000        
Shares Issued, Price Per Share   $ 11.55        
Issuance of restricted common stock (in shares) 4,095 7,791