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BENEFIT PLANS - Additional information (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2021
Jan. 31, 2024
Jan. 31, 2023
Jan. 31, 2024
Jan. 31, 2023
BENEFIT PLANS          
Decrease in pension liability, net of tax     $ 1,677,000   $ 1,820,000
Stock-based compensation       $ 276,000 198,000
Board of Directors Chairman          
BENEFIT PLANS          
Director compensation non-cash expense   $ 23,000 23,000 68,000 68,000
Accrued compensation expense related to the deferred stock units       8,000 8,000
Equity plan | President and Chief executive officer          
BENEFIT PLANS          
Stock option issued during the year 50,000        
Exercise price $ 14.24        
2016 Equity Plan | Board of Directors Chairman          
BENEFIT PLANS          
Non cash compensation expense   13,000 13,000 38,000 38,000
Restricted stock | Equity plan          
BENEFIT PLANS          
Stock-based compensation   67,000 $ 39,000 170,000 $ 25,000
Unrecognized compensation expense related to restricted shares   $ 250,000   $ 250,000  
Weighted-average remaining vesting period       3 years