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BENEFIT PLANS - changes in accumulated other comprehensive income (loss) related to the pension plan (Details) - USD ($)
 12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
BENEFIT PLANS    
Accumulated comprehensive income (loss), Pretax $ (138,000) $ 8,350,000
Defined Benefit Plan Benefit Obligation Change In Discount Rate Gain   2,360,000
Net actuarial gain (372,000) 316,000
Amortization of net loss (243,000) $ (392,000)
Settlement $ (7,597,000)  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Costs and Expenses Costs and Expenses
Accumulated comprehensive loss, Pretax $ 138,000 $ (8,350,000)
Accumulated comprehensive loss, Net of Tax 4,573,000 4,623,000
Net actuarial loss (gain) (302,000) 214,000
Settlement (5,243,000)  
Amortization of net loss (198,000) (264,000)
Accumulated comprehensive loss, Net of Tax $ (1,170,000) $ 4,573,000