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BENEFIT PLANS - Additional information (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Nov. 30, 2021 | Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2024 | Apr. 30, 2021
BENEFIT PLANS |  |  |  |  |  |  |
Accrued pension costs |  |  |  |  | $ 90,000 |  |
Defined benefit plan, fair value of plan assets |  |  |  | $ 1,030,000 | 18,054,000 |  | $ 21,102,000
Defined benefit plan, benefit obligation |  |  |  | 283,000 | 17,964,000 |  | $ 21,578,000
Settlement |  |  |  | 7,597,000 |  |  |
Actuarial gain |  |  |  | 1,667,000 | 2,414,000 |  |
Defined benefit plan, discount rate gain |  |  |  |  | 2,360,000 |  |
Defined benefit plan fair value of plan assets |  |  |  |  | 76,000 |  |
Defined benefit plan, experience gains |  |  |  |  | 130,000 |  |
Other comprehensive income |  |  |  | 5,743,000 | 50,000 |  |
Company contributions |  |  |  | 0 | 0 |  |
Stock-based compensation |  |  |  | $ 238,000 | $ 217,000 |  |
Weighted-average remaining vesting period |  |  |  | 3 years |  |  |
Stock option issued during the year |  |  |  | 14,600 | 13,000 |  |
Discount rate used to determine pension benefit obligation |  |  |  |  | 3.97% |  |
Asset allocation for the pension plan by asset category |  |  | 100.00% | 100.00% | 100.00% |  |
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 |  |
Percentage of options exercisable |  |  | 100.00% |  |  |  |
Forecast |  |  |  |  |  |  |
BENEFIT PLANS |  |  |  |  |  |  |
Aggregate defined benefit pension plan |  |  |  |  |  | $ 283,000 |
Pbgc |  |  |  |  |  |  |
BENEFIT PLANS |  |  |  |  |  |  |
Lump sum payouts of pension benefits to former employees |  |  |  | 0 | 0 |  |
Settlement |  |  |  | 7,597,000 |  |  |
Pension Plan |  |  |  |  |  |  |
BENEFIT PLANS |  |  |  |  |  |  |
Accrued pension costs |  |  |  | $ 747,000 |  |  |
Simple Internal Revenue Code Retirement Plan |  |  |  |  |  |  |
BENEFIT PLANS |  |  |  |  |  |  |
Defined contribution plan, maximum contribution percentage |  |  |  | 3.00% |  |  |
Company contributions |  |  |  | $ 74,000 | 55,000 |  |
Board of Directors Chairman |  |  |  |  |  |  |
BENEFIT PLANS |  |  |  |  |  |  |
Share issued, price per share | $ 11.55 |  |  |  |  |  |
Director compensation non-cash expense |  |  |  | $ 90,000 | $ 90,000 |  |
Weighted average |  |  |  |  |  |  |
BENEFIT PLANS |  |  |  |  |  |  |
Discount rate |  |  |  | 4.51% | 3.97% |  |
Equity plan |  |  |  |  |  |  |
BENEFIT PLANS |  |  |  |  |  |  |
Stock-based compensation |  |  |  | $ 144,000 | $ 102,000 |  |
Unrecognized compensation expense related to restricted shares |  |  |  | $ 104,000 |  |  |
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 |  |  |  |  |  |  |
Vested |  |  |  | 500,000 |  |  |
Non-vested |  |  |  | 280,773 |  |  |
Number of common stock issued under the equity plan |  |  |  | 108,961 |  |  |
Shares reserved for issuance |  |  |  | 110,266 |  |  |
2016 Equity Plan | Board of Directors Chairman |  |  |  |  |  |  |
BENEFIT PLANS |  |  |  |  |  |  |
Non cash compensation expense |  |  |  | $ 51,000 | $ 25,000 |  |
Deferred common share units of the company under the equity plan | $ 30,000 | $ 30,000 |  |  |  |  |
Share issued, price per share |  | $ 15.20 |  |  |  |  |
Issuance of restricted common stock (in shares) | 7,791 | 5,919 |  |  |  |  |

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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Number of shares issued under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Discount rate used to obtain present value of liability for unpaid claim and claim adjustment expense for short-duration contract issued by insurance entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-5 + Details
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