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BENEFIT PLANS - Additional information (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Nov. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) shares | Jan. 31, 2022 USD ($) | Jan. 31, 2021 USD ($) | Jan. 31, 2022 USD ($) | Jan. 31, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  |  | $ 67,000 | $ 90,000 | $ 200,000 | $ 270,000
Share-based Compensation, Total |  |  |  |  | 178,000 | 132,000
Percentage of options exercisable | 100 |  |  |  |  |
Term of options from the date of grant | 10 years |  |  |  |  |
Threshold period after ceases from employment for automatic termination of options | 3 months |  |  |  |  |
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 |  |  |  |  |
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 |  |  |  |  |
Non cash compensation expense |  |  | 16,000 |  | 16,000 |
Issuance of common stock settled from deferred common share units (in shares) | shares |  | 12,411 |  |  |  |
Issuance of common stock settled from deferred common share units |  | $ 20,000 |  |  |  |
Accrued compensation expense related to the deferred stock units |  |  |  |  | 8,000 | 8,000
Board of Directors Chairman [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Non Cash Director Fee Compensation |  |  | 23,000 | 15,000 | 68,000 | 58,000
Equity Plan [Member] | President and Chief Executive Officer |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Stock option issued during the year | shares | 50,000 |  |  |  |  |
Exercise price | $ / shares | $ 14.24 |  |  |  |  |
PBGC [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Payment for Pension Benefits |  |  |  |  | $ 1,847,000 |
Restricted Stock [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Weighted-average remaining vesting period |  |  |  |  | 3 years |
Restricted Stock [Member] | Equity Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Share-based Compensation, Total |  |  | 25,000 | 20,000 | $ 72,000 | 27,000
Unrecognized compensation expense related to restricted shares |  |  | $ 111,000 | $ 53,000 | $ 111,000 | $ 53,000

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