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BENEFIT PLANS - Changes in the pension plan's benefit obligation and assets (Details)
 12 Months Ended
Apr. 30, 2024
USD ($)
BENEFIT PLANS  
Benefit obligation at beginning of year $ 283,000
Service cost 152,000
Interest cost 6,000
Actuarial gain (126,000)
Benefits paid (315,000)
Change in plan assets:  
Fair value of plan assets at beginning of year 1,030,000
Actual return on plan assets (8,000)
Plan transfer (547,000)
Benefits paid (315,000)
Plan expenses $ (160,000)