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BENEFIT PLANS - Fair value hierarchy of pension plan's assets at fair value (Details) - USD ($)	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
BENEFIT PLANS
Defined benefit plan, fair value of plan assets	$ 1,030,000	$ 18,054,000	$ 21,102,000
Level 1
BENEFIT PLANS
Defined benefit plan, fair value of plan assets	1,030,000	18,054,000
Level 2
BENEFIT PLANS
Defined benefit plan, fair value of plan assets	0	0
Level 3
BENEFIT PLANS
Defined benefit plan, fair value of plan assets	0	0
Cash and cash equivalents
BENEFIT PLANS
Defined benefit plan, fair value of plan assets	1,030,000	791,000
Cash and cash equivalents | Level 1
BENEFIT PLANS
Defined benefit plan, fair value of plan assets	1,030,000	791,000
Cash and cash equivalents | Level 2
BENEFIT PLANS
Defined benefit plan, fair value of plan assets	0	0
Cash and cash equivalents | Level 3
BENEFIT PLANS
Defined benefit plan, fair value of plan assets	$ 0	0
Equity securities
BENEFIT PLANS
Defined benefit plan, fair value of plan assets		10,348,000
Equity securities | Level 1
BENEFIT PLANS
Defined benefit plan, fair value of plan assets		10,348,000
Equity securities | Level 2
BENEFIT PLANS
Defined benefit plan, fair value of plan assets		0
Equity securities | Level 3
BENEFIT PLANS
Defined benefit plan, fair value of plan assets		0
Fixed income securities
BENEFIT PLANS
Defined benefit plan, fair value of plan assets		6,915,000
Fixed income securities | Level 1
BENEFIT PLANS
Defined benefit plan, fair value of plan assets		6,915,000
Fixed income securities | Level 2
BENEFIT PLANS
Defined benefit plan, fair value of plan assets		0
Fixed income securities | Level 3
BENEFIT PLANS
Defined benefit plan, fair value of plan assets		$ 0

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- Definition

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+ References

No definition available.

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 715
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-Topic 715
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Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
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Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
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