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BENEFIT PLANS - Changes in the pension plan's benefit obligation and assets (Details) - USD ($)
 12 Months Ended
Apr. 30, 2024
Apr. 30, 2023
BENEFIT PLANS    
Benefit obligation at beginning of year $ 283,000 $ 17,964,000
Service cost 152,000 106,000
Interest cost 6,000 603,000
Actuarial gain (126,000) (1,667,000)
Benefits paid (315,000) (1,366,000)
Settlement   (15,357,000)
Benefit obligation at end of year   283,000
Change in plan assets:    
Fair value of plan assets at beginning of year 1,030,000 18,054,000
Actual return on plan assets (8,000) (103,000)
Plan transfer (547,000) 0
Benefits paid (315,000) (1,366,000)
Plan expenses (160,000) (198,000)
Settlement   (15,357,000)
Fair value of plan assets at end of year $ 747,000 1,030,000
Overfunded status   $ 747,000