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BENEFIT PLANS - Additional information (Details) - USD ($)
 1 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Nov. 30, 2021
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2024
Apr. 30, 2021
BENEFIT PLANS              
Accrued pension costs         $ 90,000    
Defined benefit plan, fair value of plan assets       $ 1,030,000 18,054,000   $ 21,102,000
Defined benefit plan, benefit obligation       283,000 17,964,000   $ 21,578,000
Settlement       7,597,000      
Actuarial gain       1,667,000 2,414,000    
Defined benefit plan, discount rate gain         2,360,000    
Defined benefit plan fair value of plan assets         76,000    
Defined benefit plan, experience gains         130,000    
Other comprehensive income       5,743,000 50,000    
Company contributions       0 0    
Stock-based compensation       $ 238,000 $ 217,000    
Weighted-average remaining vesting period       3 years      
Stock option issued during the year       14,600 13,000    
Discount rate used to determine pension benefit obligation         3.97%    
Asset allocation for the pension plan by asset category     100.00% 100.00% 100.00%    
Term of options from the date of grant     10 years        
Threshold period after ceases from employment for automatic termination of options     3 months        
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        
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        
Accrued compensation expense related to the deferred stock units       $ 30,000 $ 30,000    
Percentage of options exercisable     100.00%        
Forecast              
BENEFIT PLANS              
Aggregate defined benefit pension plan           $ 283,000  
Pbgc              
BENEFIT PLANS              
Lump sum payouts of pension benefits to former employees       0 0    
Settlement       7,597,000      
Pension Plan              
BENEFIT PLANS              
Accrued pension costs       $ 747,000      
Simple Internal Revenue Code Retirement Plan              
BENEFIT PLANS              
Defined contribution plan, maximum contribution percentage       3.00%      
Company contributions       $ 74,000 55,000    
Board of Directors Chairman              
BENEFIT PLANS              
Share issued, price per share $ 11.55            
Director compensation non-cash expense       $ 90,000 $ 90,000    
Weighted average              
BENEFIT PLANS              
Discount rate       4.51% 3.97%    
Equity plan              
BENEFIT PLANS              
Stock-based compensation       $ 144,000 $ 102,000    
Unrecognized compensation expense related to restricted shares       $ 104,000      
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      
Non-vested       280,773      
Number of common stock issued under the equity plan       108,961      
Shares reserved for issuance       110,266      
2016 Equity Plan | Board of Directors Chairman              
BENEFIT PLANS              
Non cash compensation expense       $ 51,000 $ 25,000    
Deferred common share units of the company under the equity plan $ 30,000 $ 30,000          
Share issued, price per share   $ 15.20          
Issuance of restricted common stock (in shares) 7,791 5,919