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STOCKHOLDERS' EQUITY - Stock Based Compensation (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restricted stock grants |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares outstanding | 728,775 | 723,050 | 706,450 | 701,675 |  |
Number of shares awarded | 153,575 | 151,500 |  |  |  |
Number of shares vested | 130,750 | 129,925 |  |  |  |
Vesting period | 5 years |  |  |  |  |
Number of shares forfeited | 500 | 200 |  |  |  |
Restricted stock units |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares outstanding | 230,752 | 223,802 | 230,752 | 223,802 |  |
Number of shares awarded |  |  | 80,700 | 75,026 | 77,776 |
Performance cycle |  |  | 3 years | 3 years | 3 years |
Restricted stock units | Awards granted in 2021 |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Accrual for dividend equivalent rights | $ 81,000 |  |  |  |  |
Aggregate fair value of the shares granted | 1,846,000 |  |  |  |  |
Restricted stock units | Awards granted in 2020 |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Aggregate fair value of the shares granted | 962,000 |  |  |  |  |
Restricted stock units | Awards granted in 2019 |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares forfeited |  |  |  |  | 2,750 |
Aggregate fair value of the shares granted | $ 1,446,000 |  |  |  |  |
Restricted stock units | Awards granted in 2018 |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares forfeited |  |  |  |  | 2,500 |
TSR awards |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Percentage of RSUs to vest upon achievement of specified criteria |  |  | 50.00% | 50.00% | 50.00% |
ROC Awards |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Percentage of RSUs to vest upon achievement of specified criteria |  |  | 50.00% | 50.00% | 50.00% |
2019 Incentive Plan |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Maximum number of shares authorized for issuance | 750,000 |  |  |  |  |
Number of shares outstanding | 678,027 |  |  |  |  |
2019 Incentive Plan | Restricted stock grants |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares outstanding | 447,275 |  |  |  |  |
2019 Incentive Plan | Restricted stock units |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares outstanding | 230,752 |  |  |  |  |
2016 Incentive Plan |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Maximum number of shares authorized for issuance | 0 |  |  |  |  |
2016 Incentive Plan | Restricted stock grants |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares outstanding | 281,500 |  |  |  |  |
2016 Incentive Plan | Restricted stock units |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares awarded |  |  |  |  |  | 76,250
Number of shares vested |  |  | 73,750 |  |  |
Pay-for-performance program | Restricted stock units |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares vested | 0 |  |  |  |  |
Vesting period | 3 years |  |  |  |  |
Number of shares forfeited | 0 |  |  |  |  |

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