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STOCKHOLDERS' EQUITY - Stock Based Compensation - Shares subject to awards outstanding (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 12, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Restricted stock |  |  |  |  |  |
STOCKHOLDERS' EQUITY |  |  |  |  |  |
Number of shares awarded |  | 152,955 | 153,575 | 151,500 |  |
Vesting period |  | 5 years |  |  |  |
RSUs |  |  |  |  |  |
STOCKHOLDERS' EQUITY |  |  |  |  |  |
Number of shares awarded |  | 85,250 | 85,350 | 80,700 |  |
Vesting period |  | 3 years | 3 years | 3 years | 3 years | 3 years
2022 Incentive Plan |  |  |  |  |  |
STOCKHOLDERS' EQUITY |  |  |  |  |  |
Maximum number of shares authorized for issuance |  | 750,000 |  |  |  |
Number of shares awarded | 151,180 |  |  |  |  |
Value of shares awarded | $ 3,265,000 |  |  |  |  |
2022 Incentive Plan | Restricted stock and RSU grants |  |  |  |  |  |
STOCKHOLDERS' EQUITY |  |  |  |  |  |
Shares subject to awards outstanding |  | 317,825 |  |  |  |
2022 Incentive Plan | Restricted stock |  |  |  |  |  |
STOCKHOLDERS' EQUITY |  |  |  |  |  |
Shares subject to awards outstanding |  | 149,335 |  |  |  |
2022 Incentive Plan | RSUs |  |  |  |  |  |
STOCKHOLDERS' EQUITY |  |  |  |  |  |
Shares subject to awards outstanding |  | 168,490 |  |  |  |
2019 Incentive Plan |  |  |  |  |  |
STOCKHOLDERS' EQUITY |  |  |  |  |  |
Maximum number of shares authorized for issuance |  | 750,000 |  |  |  |
Remaining shares which may be granted under the Plan |  | 0 |  |  |  |
2019 Incentive Plan | Restricted stock and RSU grants |  |  |  |  |  |
STOCKHOLDERS' EQUITY |  |  |  |  |  |
Shares subject to awards outstanding |  | 506,247 |  |  |  |
2019 Incentive Plan | Restricted stock |  |  |  |  |  |
STOCKHOLDERS' EQUITY |  |  |  |  |  |
Shares subject to awards outstanding |  | 426,625 |  |  |  |
2019 Incentive Plan | RSUs |  |  |  |  |  |
STOCKHOLDERS' EQUITY |  |  |  |  |  |
Shares subject to awards outstanding |  | 79,622 |  |  |  |
2016 Incentive Plan |  |  |  |  |  |
STOCKHOLDERS' EQUITY |  |  |  |  |  |
Maximum number of shares authorized for issuance |  | 750,000 |  |  |  |
2016 Incentive Plan | Restricted stock and RSU grants |  |  |  |  |  |
STOCKHOLDERS' EQUITY |  |  |  |  |  |
Shares subject to awards outstanding |  | 136,600 |  |  |  |
Remaining shares which may be granted under the Plan |  | 0 |  |  |  |
2016 Incentive Plan | Restricted stock |  |  |  |  |  |
STOCKHOLDERS' EQUITY |  |  |  |  |  |
Shares subject to awards outstanding |  | 136,600 |  |  |  |

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