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BENEFIT PLANS - Additional information (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2021 | Apr. 30, 2025 | Apr. 30, 2024 | Apr. 30, 2023
BENEFIT PLANS |  |  |  |
Actuarial gain |  |  | $ 126,000 |
Stock-based compensation |  | $ 423,000 | $ 317,000 |
Weighted-average remaining vesting period |  | 3 years |  |
Stock option issued during the year |  | 16,140 | 16,400 |
Accrued compensation expense related to the deferred stock units |  | $ 30,000 | $ 30,000 |
Percentage of options exercisable | 100.00% |  |  |
Asset allocation for the pension plan by asset category | 100.00% |  |  |
Threshold period after ceases from employment on account of disability for automatic termination of options | 1 year |  |  |
Threshold period after ceases from employment on account of death for automatic termination of options | 1 year |  |  |
Term of options from the date of grant | 10 years |  |  |
Threshold period after ceases from employment for automatic termination of options | 3 months |  |  |
Fair value of options | $ 252,000 |  |  |
Expected volatility | 38.04% |  |  |
Average risk-free interest rate | 1.46% |  |  |
Dividend yield | 0.00% |  |  |
Expected life | 7 years 6 months |  |  |
Pbgc |  |  |  |
BENEFIT PLANS |  |  |  |
Lump sum payouts of pension benefits to former employees |  |  | 0 |
Pension plan |  |  |  |
BENEFIT PLANS |  |  |  |
Amount of residual assets |  | 547,000 |  |
401(k) plan |  |  |  |
BENEFIT PLANS |  |  |  |
Contributions utilized |  | 92,000 | 92,000 |
Employer contribution |  | $ 39,000 | 10,000 |
Simple IRA plan |  |  |  |
BENEFIT PLANS |  |  |  |
Company contributions |  |  | $ 88,000 |
Defined contribution plan, maximum contribution percentage |  | 3.00% | 3.00% |
Board of Directors Chairman |  |  |  |
BENEFIT PLANS |  |  |  |
Director compensation non-cash expense |  | $ 90,000 | $ 90,000 |
Shares Issued, Price Per Share |  |  | $ 31.4 |
Equity plan |  |  |  |
BENEFIT PLANS |  |  |  |
Stock-based compensation |  | 311,000 | $ 237,000 |
Unrecognized compensation expense related to restricted shares |  | $ 287,000 |  |
Equity plan | President and Chief executive officer |  |  |  |
BENEFIT PLANS |  |  |  |
Stock option issued during the year | 50,000 |  |  |
Exercise price | $ 14.24 |  |  |
2016 Equity Plan |  |  |  |
BENEFIT PLANS |  |  |  |
Number of common stock issued under the equity plan |  | 141,501 |  |
Shares reserved for issuance |  | 117,226 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  | 500,000 |  |
Non-vested |  | 241,273 |  |
2016 Equity Plan | Board of Directors Chairman |  |  |  |
BENEFIT PLANS |  |  |  |
Non cash compensation expense |  | $ 50,000 | 50,000 |
Non Cash Director Compensation |  |  | $ 30,000 | $ 30,000
Shares Issued, Price Per Share |  |  |  | $ 21.97
Stock Issued During Period, Shares, Restricted Stock Award, Gross |  |  | 2,865 | 4,095

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