BENEFIT PLANS - Additional information (Details) - USD ($)	3 Months Ended
Jul. 31, 2025	Jul. 31, 2024
BENEFIT PLANS
Stock-based compensation	$ 100,000	$ 89,000
Weighted-average remaining vesting period	3 years
Accrued compensation expense related to the deferred stock units	$ 53,000	53,000
401(k) plan
BENEFIT PLANS
Employer contribution	31,000	41,000
Board of Directors Chairman
BENEFIT PLANS
Director compensation non-cash expense	23,000	23,000
Equity plan
BENEFIT PLANS
Stock-based compensation	64,000	53,000
Unrecognized compensation expense related to restricted shares	$ 569,000
Equity plan \| President and Chief executive officer
BENEFIT PLANS
Stock option issued during the year	50,000
2016 Equity Plan \| Board of Directors Chairman
BENEFIT PLANS
Non cash compensation expense	$ 13,000	$ 13,000

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).

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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.

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Gross number of share options (or share units) granted during the period.

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Amount of noncash expense for option under share-based payment arrangement.

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