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STOCKHOLDERS' EQUITY - Stock Based Compensation - RSU activities (Details) - RSUs - shares | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2024 | Jun. 30, 2024 | Aug. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
STOCKHOLDERS' EQUITY |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  | 88,250 | 85,250 | 85,350 |  |
Number of shares vested |  |  |  |  | 39,811 | 74,988 | 64,488 |  |
Number of shares forfeited |  |  |  |  | 39,811 | 3,226 | 10,538 |  |
Number of shares outstanding |  |  |  |  | 256,740 | 248,112 | 241,076 | 230,752 |
Performance cycle |  |  |  |  | 3 years | 3 years | 3 years | 3 years | 3 years
Awards granted in 2024 |  |  |  |  |  |  |  |  |
STOCKHOLDERS' EQUITY |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  | 88,250 |  |  |  |
Number of shares outstanding |  |  |  |  | 88,250 |  |  |  |
Awards granted in 2023 |  |  |  |  |  |  |  |  |
STOCKHOLDERS' EQUITY |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  |  | 85,250 |  |  |
Number of shares outstanding |  |  |  |  | 85,250 |  |  |  |
Awards granted in 2022 |  |  |  |  |  |  |  |  |
STOCKHOLDERS' EQUITY |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  |  |  | 85,350 |  |
Number of shares forfeited |  |  |  |  | 2,110 | 2,110 |  |  |
Number of shares outstanding |  |  |  |  | 83,240 |  |  |  |
Awards granted in 2021 |  |  |  |  |  |  |  |  |
STOCKHOLDERS' EQUITY |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  |  |  |  | 80,700 |
Number of shares vested | 39,811 |  |  |  |  |  |  |  |
Number of shares forfeited |  | 40,889 |  |  |  | 1,078 |  |  |
Number of shares forfeited due to applicable market condition not satisfied |  | 39,811 |  |  |  |  |  |  |
Number of shares forfeited due to retirement of executive officer before completion of applicable performance cycle |  | 1,078 |  |  |  |  |  |  |
Performance cycle |  | 3 years |  |  |  |  |  |  |
Awards granted in 2020 |  |  |  |  |  |  |  |  |
STOCKHOLDERS' EQUITY |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  |  |  |  |  | 75,026
Number of shares vested |  |  | 74,988 |  |  |  |  |  |
Number of shares forfeited |  |  |  | 38 |  |  |  |  |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period due to market condition not met. + References No definition available. + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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