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BENEFIT PLANS - Changes in the pension plan's benefit obligation and assets (Details) - USD ($)
 12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
BENEFIT PLANS    
Benefit obligation at beginning of year $ 17,964,000 $ 21,578,000
Service cost 106,000 150,000
Interest cost 603,000 503,000
Actuarial gain (1,667,000) (2,414,000)
Benefits paid (1,366,000) (1,853,000)
Settlement (15,357,000)  
Benefit obligation at end of year 283,000 17,964,000
Change in plan assets:    
Fair value of plan assets at beginning of year 18,054,000 21,102,000
Actual return on plan assets (103,000) (1,239,000)
Company contributions 0 0
Benefits paid (1,366,000) (1,703,000)
Plan expenses (198,000) (106,000)
Settlement (15,357,000)  
Fair value of plan assets at end of year 1,030,000 18,054,000
Overfunded status $ 747,000 $ 90,000