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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, 2025
Apr. 30, 2024
BENEFIT PLANS    
Accumulated comprehensive income (loss), Pretax   $ 138,000
Net actuarial gain   (2,000)
Amortization of net loss   $ 111,000
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]   Costs and Expenses
Settlement   $ (247,000)
Accumulated comprehensive income (loss), Net of Tax $ (1,230,000) (1,170,000)
Amortization of net loss   78,000
Settlement   (138,000)
Reclassification of the balance of accumulated other comprehensive income (loss) to a benefit for income taxes 1,230,000  
Accumulated comprehensive income (loss), Net of Tax   (1,230,000)
Other comprehensive loss (income) $ (1,230,000) $ 60,000