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BENEFIT PLANS - Changes in the pension plan's benefit obligation and assets (Details) - USD ($)
 12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
BENEFIT PLANS    
Benefit obligation at beginning of year $ 21,578,000 $ 23,274,000
Interest cost 503,000 504,000
Actuarial gain (2,414,000) (537,000)
Benefits paid (1,703,000) (1,663,000)
Benefit obligation at end of year 17,964,000 21,578,000
Change in plan assets:    
Fair value of plan assets at beginning of year 21,102,000 18,260,000
Actual return on plan assets (1,239,000) 2,808,000
Company contributions 0 1,847,000
Benefits paid (1,703,000) (1,663,000)
Plan expenses (106,000) (150,000)
Fair value of plan assets at end of year 18,054,000 21,102,000
Overfunded (underfunded) status $ 90,000 $ (476,000)