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BENEFIT PLANS - Additional information (Details) - USD ($)	3 Months Ended
	Jul. 31, 2022	Jul. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Other comprehensive income	$ 66,000	$ 66,000
Stock-based compensation	36,000	16,000
Board of Directors Chairman [Member]
Defined Benefit Plan Disclosure [Line Items]
Non Cash Director Fee Compensation	23,000	23,000
Accrued compensation expense related to the deferred stock units	53,000	53,000
Restricted Stock [Member] | Equity Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Stock-based compensation	22,000	$ 16,000
Unrecognized compensation expense related to restricted shares	$ 221,000
Weighted-average remaining vesting period	3 years

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