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BENEFIT PLANS - Additional information (Details) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2021 $ / shares shares | Nov. 30, 2021 USD ($) $ / shares shares | Oct. 31, 2020 shares | Sep. 30, 2020 USD ($) | Apr. 30, 2022 USD ($) shares | Apr. 30, 2021 USD ($) | Apr. 30, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  |  |  |  |  | $ 50,000 | $ 1,844,000 |
Actuarial gain |  |  |  |  |  | 2,414,000 | 537,000 |
Change in discount rate gain |  |  |  |  |  | 2,360,000 |  |
Other assumption losses |  |  |  |  |  | 76,000 |  |
Plan experience gains |  |  |  |  |  | 130,000 |  |
Share-based Compensation, Total |  |  |  |  |  | $ 217,000 | 132,000 |
Weighted-average remaining vesting period |  |  |  |  |  | 3 years |  |
Stock option issued during the year | shares |  |  |  |  |  | 13,000 |  |
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 |  |  |  |  |
Accrued compensation expense related to the deferred stock units |  |  |  |  |  | $ 30,000 | 30,000 |
Defined Benefit Plan Expected Future Benefit Payments For First Five Years Following Fiscal Year Description |  |  |  |  |  | The amount of benefit payments in future fiscal years to pension plan participants payable from plan assets is expected to be as follows: 2023 - $2,386,000, 2024 - $1,635,000, 2025 - $1,574,000, 2026 - $1,536,000 and 2027 - $1,449,000 and an aggregate of $6,370,000 is expected to be paid in the fiscal five-year period 2028 through 2032. |  |
Cash paid to directors in lieu of issuance of deferred common share units |  |  |  |  | $ 20,000 |  |  |
Defined benefit from pension plan |  |  |  |  |  | $ 0 | 476,000 |
Defined Benefit Plan, Plan Assets, Amount |  |  |  |  |  | 18,054,000 | 21,102,000 | $ 18,260,000
Defined Benefit Plan, Benefit Obligation |  |  |  |  |  | 17,964,000 | 21,578,000 | $ 23,274,000
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  |  |  |  | 0 | 1,847,000 |
Number of common stock issued to directors for settlement of deferred stock units | shares |  |  |  | 12,411 |  |  |  |
Pension Plan [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Defined benefit from pension plan |  |  |  |  |  | 90,000 |  |
Simple Internal Revenue Code, Retirement Plan [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  |  |  |  | $ 55,000 | 36,000 |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  |  |  |  |  | 3.00% |  |
Board of Directors Chairman [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Non Cash Director Fee Compensation |  |  |  |  |  | $ 90,000 |  |
Shares Issued, Price Per Share | $ / shares |  | $ 15.20 |  |  |  |  |  |
Equity Plan [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation, Total |  |  |  |  |  | 102,000 | $ 78,000 |
Unrecognized compensation expense related to restricted shares |  |  |  |  |  | $ 81,000 |  |
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 |  |  |  |  |
2016 Equity Plan [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | shares |  |  |  |  |  | 500,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares |  |  |  |  |  | 303,164 |  |
2016 Equity Plan [Member] | Board of Directors Chairman [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Non cash compensation expense |  |  |  |  |  | $ 25,000 |  |
Shares Issued, Price Per Share | $ / shares | $ 8.54 |  |  |  |  |  |  |
Non Cash Director Compensation | $ 30,000 |  |  |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | shares | 10,536 | 5,919 |  |  |  |  |  |
Weighted Average [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  | 3.97% | 2.48% |
PBGC [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Payment for Pension Benefits |  |  |  |  |  | $ 0 | $ 1,847,000 |

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- Definition Descriptive information regarding the employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid in the current remaining fiscal period. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. Description may include a range of expected contributions, required minimum contribution, whether the expected contribution is discretionary, and further explanation. + References No definition available. + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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