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STOCK-BASED COMPENSATION, Non-vested Service-based Restricted Stock Unit Awards (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Service-Based Restricted Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 200,000 | $ 200,000 | $ 400,000 | $ 400,000
2021 | 410,000 |  | 410,000 |
2022 | 784,000 |  | 784,000 |
2023 | 538,000 |  | 538,000 |
2024 | 24,000 |  | 24,000 |
2025 | 5,000 |  | 5,000 |
Unrecognized Expense | $ 1,761,000 |  | 1,761,000 |
Performance-Based Restricted Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense |  |  | $ 0 |
Restricted Stock and RSU [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares issued from vesting of restricted stock (in shares) |  |  | 16,080 |

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