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STOCKHOLDERS' EQUITY - Stock Based Compensation - RSUs (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2019 | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Restricted stock units |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Number of shares vested | 64,488 | 73,750 | 64,488 | 73,750 |  |  |  |  |
Number of shares forfeited | 10,538 |  | 10,538 |  |  |  |  |  |
Number of shares outstanding | 155,726 | 150,052 | 155,726 | 150,052 |  | 230,752 | 230,752 | 223,802 | 223,802
Number of shares not earned due to applicable market conditions not being satisfied |  |  | 10,538 |  |  |  |  |  |
Performance cycle |  |  | 3 years |  |  |  |  |  |
Restricted stock units | Awards granted in 2022 | Vesting Date: June 30, 2025 |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Number of shares granted |  |  | 85,350 |  |  |  |  |  |
Number of shares outstanding | 85,350 |  | 85,350 |  |  |  |  |  |
Restricted stock units | Awards granted in 2021 |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Aggregate fair value of the shares granted | $ 1,846,000 |  | $ 1,846,000 |  |  |  |  |  |
Restricted stock units | Awards granted in 2021 | Vesting Date: June 30, 2024 |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Number of shares granted |  |  | 80,700 |  |  |  |  |  |
Number of shares outstanding | 80,700 |  | 80,700 |  |  |  |  |  |
Restricted stock units | Awards granted in 2020 |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Aggregate fair value of the shares granted | $ 962,000 |  | $ 962,000 |  |  |  |  |  |
Restricted stock units | Awards granted in 2020 | Vesting Date: June 30, 2023 |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Number of shares granted |  |  | 75,026 |  |  |  |  |  |
Number of shares outstanding | 75,026 |  | 75,026 |  |  |  |  |  |
Restricted stock units | Awards granted in 2019 |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Number of shares forfeited |  |  |  |  | 2,750 |  |  |  |
Restricted stock units | 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 |  |  |  |  |  |
Restricted stock units | Awards granted in 2018 |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Number of shares forfeited |  |  |  |  | 2,500 |  |  |  |
Restricted stock units | 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 |  |  |  |  |  |
ROC Awards | Awards granted in 2021 |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Accrual for dividend equivalent rights | $ 108,000 |  | $ 108,000 |  |  |  |  |  |
ROC Awards | Years granted: 2018 - 2020 |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Weight |  |  | 50.00% |  |  |  |  |  |
ROC Awards | Years granted: 2018 - 2020 | Minimum |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Average of annual ROC |  |  | 7.00% |  |  |  |  |  |
ROC Awards | Years granted: 2018 - 2020 | Maximum |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Average of annual ROC |  |  | 9.75% |  |  |  |  |  |
ROC Awards | Years granted: 2021 - 2022 |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Weight |  |  | 50.00% |  |  |  |  |  |
ROC Awards | Years granted: 2021 - 2022 | Minimum |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Average of annual ROC |  |  | 6.00% |  |  |  |  |  |
ROC Awards | Years granted: 2021 - 2022 | Maximum |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Average of annual ROC |  |  | 8.75% |  |  |  |  |  |
TSR awards |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Performance cycle |  |  | 3 years |  |  |  |  |  |
TSR awards | Years granted: 2018 - 2020 |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Weight |  |  | 50.00% |  |  |  |  |  |
TSR awards | Years granted: 2018 - 2020 | Minimum |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Average of annual TSR |  |  | 7.00% |  |  |  |  |  |
TSR awards | Years granted: 2018 - 2020 | Maximum |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Average of annual TSR |  |  | 12.00% |  |  |  |  |  |
TSR awards | Years granted: 2021 - 2022 |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Weight |  |  | 50.00% |  |  |  |  |  |
TSR awards | Years granted: 2021 - 2022 | Minimum |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Average of annual TSR |  |  | 6.00% |  |  |  |  |  |
TSR awards | Years granted: 2021 - 2022 | Maximum |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Average of annual TSR |  |  | 11.00% |  |  |  |  |  |
Pay-for-performance program | Restricted stock units |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |  |  |  |
Number of shares vested | 0 |  | 0 |  |  |  |  |  |
Number of shares forfeited | 0 |  | 0 |  |  |  |  |  |

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