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BENEFIT PLANS - Additional information (Details)
 1 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2021
$ / shares
shares
Nov. 30, 2021
USD ($)
$ / shares
shares
Oct. 31, 2020
shares
Sep. 30, 2020
USD ($)
Apr. 30, 2022
USD ($)
shares
Apr. 30, 2021
USD ($)
Apr. 30, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]                
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent           $ 50,000 $ 1,844,000  
Actuarial gain           2,414,000 537,000  
Change in discount rate gain           2,360,000    
Other assumption losses           76,000    
Plan experience gains           130,000    
Share-based Compensation, Total           $ 217,000 132,000  
Weighted-average remaining vesting period           3 years    
Stock option issued during the year | shares           13,000    
Percentage of options exercisable     100          
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  
Defined Benefit Plan Expected Future Benefit Payments For First Five Years Following Fiscal Year Description           The amount of benefit payments in future fiscal years to pension plan participants payable from plan assets is expected to be as follows: 2023 - $2,386,000, 2024 - $1,635,000, 2025 - $1,574,000, 2026 - $1,536,000 and 2027 - $1,449,000 and an aggregate of $6,370,000 is expected to be paid in the fiscal five-year period 2028 through 2032.    
Cash paid to directors in lieu of issuance of deferred common share units         $ 20,000      
Defined benefit from pension plan           $ 0 476,000  
Defined Benefit Plan, Plan Assets, Amount           18,054,000 21,102,000 $ 18,260,000
Defined Benefit Plan, Benefit Obligation           17,964,000 21,578,000 $ 23,274,000
Defined Benefit Plan, Plan Assets, Contributions by Employer           0 1,847,000  
Number of common stock issued to directors for settlement of deferred stock units | shares       12,411        
Pension Plan [Member]                
Defined Benefit Plan Disclosure [Line Items]                
Defined benefit from pension plan           90,000    
Simple Internal Revenue Code, Retirement Plan [Member]                
Defined Benefit Plan Disclosure [Line Items]                
Defined Benefit Plan, Plan Assets, Contributions by Employer           $ 55,000 36,000  
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent           3.00%    
Board of Directors Chairman [Member]                
Defined Benefit Plan Disclosure [Line Items]                
Non Cash Director Fee Compensation           $ 90,000    
Shares Issued, Price Per Share | $ / shares   $ 15.20            
Equity Plan [Member]                
Defined Benefit Plan Disclosure [Line Items]                
Share-based Compensation, Total           102,000 $ 78,000  
Unrecognized compensation expense related to restricted shares           $ 81,000    
Equity Plan [Member] | President and Chief Executive Officer                
Defined Benefit Plan Disclosure [Line Items]                
Stock option issued during the year | shares     50,000          
Exercise price | $ / shares     $ 14.24          
2016 Equity Plan [Member]                
Defined Benefit Plan Disclosure [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | shares           500,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares           303,164    
2016 Equity Plan [Member] | Board of Directors Chairman [Member]                
Defined Benefit Plan Disclosure [Line Items]                
Non cash compensation expense           $ 25,000    
Shares Issued, Price Per Share | $ / shares $ 8.54              
Non Cash Director Compensation $ 30,000              
Stock Issued During Period, Shares, Restricted Stock Award, Gross | shares 10,536 5,919            
Weighted Average [Member]                
Defined Benefit Plan Disclosure [Line Items]                
Discount rate           3.97% 2.48%  
PBGC [Member]                
Defined Benefit Plan Disclosure [Line Items]                
Payment for Pension Benefits           $ 0 $ 1,847,000