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STOCKHOLDERS' EQUITY - Stock Based Compensation (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stock Based Compensation |  |  |  |  |  |
Number of shares outstanding |  |  | 223,802 | 225,026 |  |
Restricted stock |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares awarded | 151,500 | 149,550 |  |  |  |
Number of shares forfeited | 200 |  |  |  |  |
Number of shares vested | 129,925 | 122,125 |  |  |  |
Number of shares outstanding | 723,050 | 701,675 | 701,675 | 674,250 |  |
Vesting period | 5 years |  |  |  |  |
RSUs |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares awarded |  |  | 75,026 | 77,776 | 76,250 |
Number of shares forfeited |  |  |  | 5,250 |  |
Number of shares outstanding | 223,802 | 225,026 |  |  |  |
TSR awards |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Percentage of RSUs to vest upon achievement of specified criteria | 50.00% |  |  |  |  |
ROC Awards |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Percentage of RSUs to vest upon achievement of specified criteria | 50.00% |  |  |  |  |
2019 Incentive Plan |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Maximum number of shares authorized for issuance | 750,000 |  |  |  |  |
2019 Incentive Plan | Restricted stock and RSU grants |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares outstanding | 450,952 |  |  |  |  |
2019 Incentive Plan | Restricted stock |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares outstanding | 300,900 |  |  |  |  |
2019 Incentive Plan | RSUs |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares outstanding | 150,052 |  |  |  |  |
2016 Incentive Plan |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Additional awards authorized | 0 |  |  |  |  |
2016 Incentive Plan | Restricted stock and RSU grants |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares outstanding | 495,900 |  |  |  |  |
2016 Incentive Plan | Restricted stock |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares outstanding | 422,150 |  |  |  |  |
2016 Incentive Plan | RSUs |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares awarded |  |  |  |  |  | 76,250
Number of shares forfeited |  |  | 51,907 |  |  |
Number of shares vested |  |  | 24,343 |  |  |
Number of shares outstanding | 73,750 |  |  |  |  |
Pay-for-performance program | RSUs |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Number of shares forfeited | 0 |  |  |  |  |
Number of shares vested | 0 |  |  |  |  |
Vesting period | 3 years |  |  |  |  |
Pay-for-performance program | RSUs | Awards granted in 2020 |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Aggregate fair value of the shares granted | $ 962,000 |  |  |  |  |
Pay-for-performance program | RSUs | Awards granted in 2019 |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Aggregate fair value of the shares granted | 1,446,000 |  |  |  |  |
Pay-for-performance program | RSUs | Awards granted in 2018 |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |
Aggregate fair value of the shares granted | $ 1,006,000 |  |  |  |  |

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