BENEFIT PLANS - Additional information (Details) - USD ($)	3 Months Ended
Jul. 31, 2021	Jul. 31, 2020	Apr. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Share-based Compensation, Total	$ 16,000	$ 40,000
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	66,000	90,000
Deferred Compensation Arrangement with Individual, Allocated Share-based Compensation Expense	53,000	62,000
Board of Directors Chairman [Member]
Defined Benefit Plan Disclosure [Line Items]
Non Cash Director Fee Compensation	23,000	22,000
Equity Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Share-based Compensation, Total	16,000	18,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total	$ 167,000	$ 94,000
Restricted Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	20,500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	21,500		29,000

The total non-cash director fee compensation related to the deferred common share units.

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Amount of expense recognized from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments), awarded to key employees or individuals. Excludes amount related to plans that cover generally all employees (for example, but not limited to, qualified pension plans).

+ References

No definition available.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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- Definition

Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount of noncash expense for share-based payment arrangement.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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