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STOCKHOLDERS' EQUITY - Stock Based Compensation - RSU activities (Details) - Restricted stock units - shares | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Stock Based Compensation |  |  |  |
Number of shares granted | 85,350 | 80,700 | 75,026 |
Number of shares vested | 64,488 | 73,750 | 24,343 |
Number of shares forfeited | 10,538 |  | 51,907 |
Number of shares outstanding | 241,076 | 230,752 | 223,802 | 225,026
Performance cycle | 3 years |  |  |
Awards granted in 2022 | Vesting Date: June 30, 2025 |  |  |  |
Stock Based Compensation |  |  |  |
Number of shares granted | 85,350 |  |  |
Number of shares outstanding | 85,350 |  |  |
Awards granted in 2021 | Vesting Date: June 30, 2024 |  |  |  |
Stock Based Compensation |  |  |  |
Number of shares granted | 80,700 |  |  |
Number of shares outstanding | 80,700 |  |  |
Awards granted in 2020 | Vesting Date: June 30, 2023 |  |  |  |
Stock Based Compensation |  |  |  |
Number of shares granted | 75,026 |  |  |
Number of shares outstanding | 75,026 |  |  |
Awards granted in 2019 |  |  |  |
Stock Based Compensation |  |  |  |
Number of shares forfeited |  |  |  | 2,750
Number of shares not earned due to applicable market conditions not being satisfied | 10,538 |  |  |
Awards granted in 2019 | Vesting Date: June 30, 2022 |  |  |  |
Stock Based Compensation |  |  |  |
Number of shares granted | 77,776 |  |  |
Number of shares vested | 64,488 |  |  |
Number of shares forfeited | 13,288 |  |  |
Awards granted in 2018 |  |  |  |
Stock Based Compensation |  |  |  |
Number of shares forfeited |  |  |  | 2,500
Awards granted in 2018 | Vesting Date: June 30, 2021 |  |  |  |
Stock Based Compensation |  |  |  |
Number of shares granted | 76,250 |  |  |
Number of shares vested | 73,750 |  |  |
Number of shares forfeited | 2,500 |  |  |

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- Definition The number of shares not earned during the period due to metrics not met 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 No definition available. + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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)(2)(iii)(03) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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)(2)(iii)(02) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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